Harry a bastard of House Velaryon of a side branch from Essos. His mother Mila Velaryon had long gold hair and deep purple eyes. His farther Aerys Taryargen with his silver-gold hair and purple hair. He was the first born son of King Aerys II, and then he got his sister-wife pregnant with a son so he legitimized his bastard son Harry to Harry Targaryen. Harry was then given the Lordship over Dragonstone. But since he was not old enough his mother took over in his stead, while he stayed behind to learn at Kings Landing.
Harry and his mother kept the secret that she has a trunk full of dragon eggs that are turned to stone. As the years passed Harry became a strong warrior, skilled in combat, sword, bow, horse-back and other things. As the years passed Aerys his father kept getting worse and worse, he burned people alive and punished his wife and his Aunt.
Then when Robert's rebellion started he new that they weren't going to win because they didn't have a bigger army. So he new that he had to get the Queen Rhaelle, Princess Elia, Prince Viserys, Princess Rhaenys, Prince Aegon and the unborn child of the Queen and King. And when the Queen was giving birth Stannis Baratheron and some others attacked them.
Harry made sure that the city was well protected so they could get in and kill his family. When Harry saw that they were going to lose he knew that he had to get his family out. So he devised a plan for his remaining ships his army would protect the ships full of women, children and the elderly. And the Queen, Princess and Princes as they made there way to Essos.
Where they would live, the ships that were protecting them would meet up with them after making sure they were not being followed so the traitors wouldn't find them. But along the way the Queen started getting worse and worse. When they reached Tryosh she died but not before naming him the heir to the throne of Westros.
Viserys over the years started getting out of hand when his mother named Harry King of Westros, then one day he up and vanished with his little sister and several guards. Harry knew that he wouldn't find them and they couldn't go back to Westros. So he bought enough land for his people and army. He took control of the Gold company.
The Golden Company is a company of sellswords founded by the Great Bastard, Bittersteel. They are considered the largest, most famous, and most expensive sellsword or mercenary company in the Free Cities. Despite the notorious unreliability of sellswords, the Golden Company is reputed to have never broken a contract. Their motto is "Our word is good as gold."
When Harry Strickland, called Homeless Harry, the current company commander found out that Harry Targaryen was the King they agreed to swear allegiance to him and help find his find his Queen Daenerys. And when they found out that Viserys was going to sell his sister to the leader of the Dothraki. Harry decided to go teach him a lesson.
They arrived to see the horde stationed outside Pentos, so Harry brought his army and attacked them. They surprised them, killing a lot in the first few minutes. But then they started putting up a fight but it didn't last long. An hour later the army was gone, they captured the women, children and the animals. With that he turned towards Pentos to find Daenerys, and kill the leader and Viserys.
The guards of the city didn't try to stop him because they didn't have enough of a army to stop them, so they let them walk on in. They found Dothraki guards surrounding their leader and Daenerys. He was so angry that filth was touching her his Queen.