Disclaimer- I don't own Harry Potter. Nor am I making any profit from this story.

"Speaking"

Thoughts

'Telepathy'

"Spells"

"Foreign Languages"

§Parseltongue§

Life was weird at times, very weird and chaotic. That was something that fifteen year old Harry James Potter could tell you. Adding magic to life just amplified it many times. So many things had happened to him since he was little. Weird things always happened around him and he was blamed for it by his muggle relatives.

When he was eleven he had received an invitation to a school for magic. Honest to god MAGIC! The one thing his relatives had always swore didn't exist. At least he now knew why they hated him. He hadn't expected that at the end of the year he would end up facing his parents murderer and saving a highly prized magical stone that granted immortality and riches beyond man's dreams.

Second year he battled another version of Voldemort and fought and killed a basilisk after finding out he was a Parselmouth.

Third year an insane wizard had escaped from Azkaban supposedly to finish Harry off. In the end Harry discovered that wizard was innocent having been framed, his godfather and not out to kill him. Harry had both time traveled and banished over a hundred Dementors from the school grounds that same night.

When he was fourteen he had been entered into a deadly Tournament to fight his way through the three tasks. In the third task he found himself kidnapped, a fellow student killed and himself used in a ritual to revive Voldemort. It was only through luck and the incompetence of his enemies that he escaped. The Minister had denied his return and had all but broke with Dumbledore.

Harry had been banished back to his muggle relatives and this led to this night. Here he was now fifteen years old facing off against a pair of Dementors after his cousin had knocked him around a bit.

"Expecto – Expecto Patro – " Harry's head gave a heavy throb throwing off his concentration. He despaired as his wand was knocked from his hand before he was seized by surprisingly strong arms. Harry struggled as the mouth of the Dementor came closer to him. He screamed as his the pain in his mind spiked, there was a wrenching sensation before darkness consumed him.

Salazar Ezekiel Slytherin. Some of Prium Slytherin and Magdalena Slytherin nee Peverell. Eldest child of four. Half-blood wizard born to Half-blood father and Pureblood mother. Founder of Hogwarts. Husband of two and father of ten. Reviled. Dark Wizard. Evil. Dark Lord.

Salazar scowled as he awoke in the body of a fifteen year old wizard over six centuries after he had died.

Time had distorted his history and that of the other Founders greatly. Twisted them into a mockery of themselves. His House was now the House of Evil and Godric's was known as Light and Noble. Rowena's House was now the House of Nerds and Snobs and Helga's the House of Leftovers and Nobodies. Honestly by modern terms each and every one of his fellows and himself would be called dark wizards and witches. Most modern witches and wizards would never understand the things they had done. Never understand the necessity of their actions. They did not know the life of struggle they lived in the past. They were safely hidden from muggles and had a government to try and protect them.

Salazar shook his head at the foolishness of the future. Of what had become of the Wizarding World. The damned Purebloods were destroying the Wizarding World. Stagnation and corruption was seeping into every corner of their society. They advocated the removal or sometimes outright death of the New Bloods. He himself had a burning hatred of muggles and had his own issues with the New Bloods but it had largely been blown out of proportion.

Salazar felt that his hatred of muggles was justified. He had only been twenty-two when he returned from Rome with his father to find their home on fire. They had found his twelve year old brother Octavius naked upon their lawn. It was clear even from a distance that he had been tortured. His sweet little brother who loved listening to Salazar's tales or gazing in awe at the magic he he willed upon the world. Octavius had been beaten savagely, strangled, emasculated, defecated upon and gutted. He had been left to rot on the ground like garbage.

His mother and younger sisters, ages eleven and seven, had been kidnapped from their home.

It was in the woodlands nearby their home that his father and he had found the remains of their family burned and left to rot in burned out pyres. Salazar's fists clenched in remembered rage and pain. Witches and wizards didn't have the Flame-Freezing Charm back then to keep them safe and their wands had obviously been confiscated. It was only when they moved them to be buried that they had found out all three had been violated before they were killed. Salazar and his father had roared out their hatred, anger and pain before they tracked down the perpetrators.

His father and Salazar had tracked them to a nearby village. To their fury those responsible were not only muggles but also wizards who had wanted what the Slytherin family had. His father and he had not made their end easy or painless. They had slaughtered the entire village along with their livestock before they burned the village to the ground.

They had cursed the ground to never grow fertile crops again, and that any structure built upon the land would decay quicker than natural and at the worst time. That wasn't the last time muggles had attacked those that Salazar loved but it was the most heart-wrenching. His father and he had returned to their ruined home and buried the family beneath their blood warded family cemetery. They had gathered what riches and property they still had and had traveled to the keep of Salazar's uncle, Efelstan in modern day Scotland. There he continued his studies both magic and martial before leaving to travel the world.

Salazar had met the man and a woman who would help him forever change the shape of the future of wizard kind in 987 and 989 respectively. Godric of the Hollow, as he was known then, was twenty-seven when they met to Salazar thirty-two. Godric was a half-blood born in what would become known as Godric's Hallow. His father Alferic was a local Lord and his mother a pureblood witch.

It wasn't until later that Godric had taken up the name Gryffindor when he slew a monstrous griffin that was terrorizing a village. The red haired bearded man was a monster of a wizard, both taller than Salazar's own considerable height of six feet and, to borrow a modern phrase, built like a brick shithouse. He was a monster with a sword and a wand. Godric was loyal, courageous and would do almost anything for a friend. He also didn't always think things through, was stubborn, brash and loved to fight so much that it often got him into trouble. Salazar couldn't even begin to count the number of brawls and duels the two had participated in because of Godric's brashness.

The woman he had met was Rowena Ravenclaw. A half-blood daughter of New Blood noble father and half-blood mother. It was quickly apparent that Rowena had a vast potential in both intelligence and magic. She had refused her betrothal to a muggle nobleman and had fled the castle when she was nineteen. It was then that Salazar and Godric met her.

The three of them had met Helga in 992. Helga was a half-blood witch. Her parents had been from the Northlands, or Scandinavia as it was known now. They had been farmers who moved to Wales to start a new life. They were killed in a raid when Helga was thirteen leaving her with little magical knowledge but that of Runes and a few cantrips. Helga escaped from the attackers and was later found by a witch named Griselda who made her livelihood as a healer.

It was Griselda that had taught Helga to read and write. She also taught her to identify and gather herbs, plants, liquids and animal products. She taught her how to brew and make healing potions and poultices and other concoctions. It was while with her that Helga found she had a unique bond with animals. She was able to understand them and make herself understood to them.

For the next five years they traveled learning together and planning their future. It was during these travels that Salazar had met his first wife Marla, a fierce and proud witch from Greece. Marla had had long hair the color of amber and eyes as blue as the sea. She had wicked temper but could also be the sweetest woman you had ever met. She had been the great love of Salazar's life. Salazar's first born son Thalon had been born in 995 before he was swiftly followed by his sister Elizabeta a year and a half later.

It had become clear in their travels that magical people were in danger and a large portion of the population knew little of magic. They were a danger to themselves and others. Salazar had called together a meeting of the Council of Wizards, a collection of Noble witches and wizards who ruled over those of lesser blood. There he and his friends had argued and gained support to build a school where they could gather magical children together. A school where many students could learn from Masters in safety. To help bring a new stability to their country.

They used land left to Salazar by his Uncle Efelstan. They had originally planned to use the keep of his Uncle but quickly found it was too small. Instead they decided to build an entirely new castle while teaching classes in the keep. They begun the construction of Hogwarts in the year 997 with the help of the dwarves and took them nearly seven years. Salazar and his friends had gone on to expand the lake nearby, stocking it with fish for food and even a squid Godric had discovered somewhere and befriended. A colony of merpeople had been allowed to make their own settlement in the lake in exchange for helping to catch food for the school.

The four of them had also expanded the forest next to the school. They had made the forest into a safe haven for magical creatures with Helga's help alongside several druids. The creatures would have a safe place to live and they would be able to gather ingredients from them for potions, wands and artifacts. Salazar had even brokered a treaty with two clans of centaurs to be allowed to live in the forest in peace in return for them gathering game, herbs, potion ingredients and defending the future students. Masters from around the country and those near flocked to the school to share their knowledge and to learn from each other.

A village, Helga later named Hogsmeade, sprung up near the school as they offered safety through power and wards. The village enjoyed their protection while the school would be provided for by farms in the village. It had provided witches and wizards a safe place to live and barter and to learn about what the Founders were trying to accomplish. The village boomed over the years as magical families moved to the area to allow their children to more easily reach the school.

Salazar had built his Chamber of Secrets, named so by his daughter Elizabeta, to hold his most secret research away from the students and as home for the basilisk, Seleia, that he had bred as an experiment. He had bred her not only for the ingredients he could get from her body but also as protection for the school from any who would threaten it and the precious children within. His heart ached at the thought of her death. Unfortunately she was quite insane in the end. She had always adored children, especially his own, and would have wanted to be killed rather than harm a child no matter their blood. He felt a stab of hatred for Tom Riddle, his descendant who had turned his beloved friend away from her sacred task.

Salazar sneered at the thought of Tom Riddle and his quest to finish what he thought was Salazar's dream, his noble work. Salazar had never hated New Bloods, had never wanted them dead or excluded from Hogwarts or the Wizarding world. He knew that they were important for the continuation of magic. Their blood renewed the blood of the Old lines and brought new lines into the magical world.

It was true that Salazar had argued with the other Founders over them. Not because he wanted them banned but because he wished for the New Bloods to start their educations separately from the magically raised students. Salazar often found New Bloods to be frightened of themselves, their powers, and many times their own relatives. Unless they had the good fortune to be born into Noble families New Bloods were mostly uneducated, illiterate, and unhygienic. They were a great security risk to the school and their fellow students as they had most often been taught to fear and revile magic due to priests. Priests were likely to be the highest authority figure a New Blood would ever meet and religion preached against the evils of magic.

Back then they didn't have Unplottable and Muggle-Repelling Charms. There was nothing stopping the New Bloods from leading others to their safe haven. He had wanted the taken from their muggle parents and to be adopted into magical families. If not that then for them to at least be educated before being allowed to attend Hogwarts so they were on equal footing. The others had disagreed. They had thought they had no right to separate a child from their parents.

Salazar's warnings came true as he knew it would, not that even he felt like saying I told you so when it happened. In 1012 a large group of dissatisfied witches and wizards, muggles, Goblins and Orcs attacked the village of Hogsmeade with the intention of drawing the Founders out for a fight. To the armies detriment they did. Salazar and Godric had lead the charge against them, leaving behind Rowena and Helga to guard the school and the students. Salazar had known that Godric had a fierce hatred of goblins for killing his parents and younger brother Aflestan.

He had only been able to watch as Godric had slaughtered them by the dozen. Godric personally slew the royal family to the last babe and took the sword of King Ragnuk the 1st for his own and later had his name engraved upon it in insult. Salazar himself, as an insult and security that it wouldn't happen again, had bound the souls and magic of their enemies to the many sets of armor and the statues of Hogwarts. Stripped of their identities they were meant to guard Hogwarts for all time, immortal and unable to pass on. Helga had used their blood and bones to strengthen the wards and charms around Hogwarts.

Quicker and quicker the memories of his life flashed past his minds eyes. It was at the end when the memories of Harry James Potter flashed before his eyes. Memories of the 'Modern' Wizarding World. Memories of Hogwarts and memories of his "descendant". Tom Riddle then Lord Voldemort. Disgust curled in Salazar's gut.

Over his nearly three and half centuries of life Salazar Slytherin had battled many would be Dark Lords and Ladies and had battled several true ones. Tom Riddle had nothing on them. Salazar had battled against ancient horrors, Fae, demons and daemons summoned from the Outer Planes. He had killed more people that Riddle had ever thought about and for reasons history would never know.

Growling Salazar kicked the demon in the chest sending it backwards several feet. Salazar reached out for the link he had always felt. Pulling on it caused a long sword to appear in his hand. Cadfæl. A sword forged for him in a dragon's breath. A sword capable of killing supernatural beings, the undead, demons and daemons.

The blade was made of dark iron, appearing completely black in color aside from the band of gold down the middle engraved with runes more ancient than any had seen in these times. The hilt felt as comfortable in his hand as it ever had. The hilt was a stylized dark green scaled basilisk with yellow diamonds for eyes. The end of the hilt was the tail which was slightly curved where it wrapped around a large dark diamond and it's mouth was opened as if to swallow the blade. Gripping the sword he stabbed the Dementor in the chest causing it to scream. Normally no mortal blade could touch them and it had arrogantly allowed him to attack it.

"Die vermin!" Salazar hissed, channeling the power of Light into the blade causing white flames to erupt along the blade. The Dementor screeched horribly as it was consumed by the blade. Several motes of light left it's body. Salazar could sense their relief and their gratitude before they disappeared.

The Dementor grew frantic before it shrunk down before Salazar's eyes leaving a dark purple, almost black crystal on the ground. Salazar could sense the miasma coming off it. The Dementor, in a desperate bid to live, had crystallized itself. With the crystal a witch or wizard could summon and control the Dementor. The demon obviously thought Salazar would be greedy and power hungry enough not to pass up a potentially powerful servant.

"Too bad for you demon I don't truck with your kind." Salazar said before he thrust Cadfæl into the crystal breaking it and killing the demon. Turning his attention to the other Dementor he saw it attempting to flee with the body of a teenager laying on the ground drooling and staring into the air. Gripping Cadfæl tightly he willed it's form to change. Salazar grinned when it became a spear before throwing it through the air. The Dementor wailed as it was impaled and stuck to the wall.

§Who sent you demon?§ Slytherin snarled in Parseltongue. §Tell me swiftly and I will make your end quick.§

§KiLlEr! MuRdeR oF mY KiN.§ The Dementor rasped.

§That is not what I asked.§ Salazar hissed his eyes narrowed. Channeling a bit of light into the spear caused the Dementor to screech in pain.

§WItCh! MInIsTrY WItCh! FOuL, lOaThSoMe CrEaTuRe!§ The Dementor hissed. §I WiLl bE aVeNgEd. My BrOtHeRs WilL cOmE fOr YoU!§

§Not before you are dead.§ Salazar replied before he incinerated the demon. Concentrating he forced it into crystal form. Perhaps he would have some use for it. It could perhaps be used for a Ritual of Banishment.

Just like when he killed the other Dementor several motes of light escaped from it's body. Salazar caught the one belonging to the muggle before him and gently coaxed it towards the body. With a magic forgotten in this Age he retied the soul to the body of the muggle causing him to gasp as his consciousness reconnected to his body. He screamed before he passed out. Grimacing Salazar found the wand he had dropped before he grabbed the muggle. Groaning as his smaller than normal body struggled with the weight he cheated by putting a lightening charm on the muggle. Since he didn't have any magic, at least none he could access as Salazar quickly categorized the boy as a Squib, the spell worked easier than it would have on a witch or wizard.

-0-0-0-0-0-0-

Salazar rummaged around the pile of discarded items in his closet. He was doing his best to ignore his anger at Dumbledore and the faint sense of betrayal he got from the revelations that had been revealed to him that night. He hummed as he found what he was looking for. A wooden box five inches long and three inches wide. Biting his tongue he carefully carved Runes for containment, concealment and purifying on it along with several different kinds of locking and avoidance Runes.

Salazar grunted. The magic of this body was crude and not used to the tasks he was using it to perform but Salazar was nothing if not stubborn. He was a Master of Magic and a servant. He was talented and powerful. He channeled his magic through his fingers powering up the Runes. They glowed briefly before settling down. If he concentrated on it enough he could sense their gentle hum as they worked to keep the crystal safe from curious people and keep it's miasma contained.

An owl flew through the window and alighted on hid desk. Reaching for letter tied to it's leg Salazar vaguely recognized it as the crest of the Ministry of Magic. The owl flew back out the window as Salazar broke the seal. Reading Salazar fought the urge to incinerate it.

Dear Mr. Potter,

We have received intelligence that you caused an unknown magical phenomenon at twenty-three minutes past nine this evening in a Muggle-inhabited area and in the presence of a Muggle.

The severity of this breach of the Decree for the Reasonable Restriction of Underage Sorcery has resulted in your expulsion from Hogwarts School of Witchcraft and Wizardry. Ministry representatives will be calling at your place of residence shortly to destroy your wand.

As you have already received an official warning for a previous offence under Section 13 of the International Confederation of Wizards' Statute of Secrecy, we regret to inform you that your presence is required at a disciplinary hearing at the Ministry of Magic at 9 a.m. on the twelfth of August.

Hoping you are well,

Yours sincerely,

Mafalda Hopkirk

Improper Use of Magic Office

Ministry of Magic

Like hell! Salazar thought with anger.

He couldn't be arrested. He had too much to do. He needed to sort out his mind. Was he Salazar Ezekiel Slytherin or Harry James Potter or both? Three hundred and twenty-seven year old Master of Magic or fifteen year old teenage Gryffindor? It was irritating and distracting having the memories of two lives. He needed to time to come to terms with what was happening to him.

A/N: I know that this premise has been done before, and done quite well in several stories, but I wanted to add my own to it. This story will have slight crossovers with the television shows of Merlin and BTVS along with other genres.