Now, after the War for the Dawn was over and the relations between Westeros and Essos very unstable to say the least, the maesters of Oldtown were actually very willing to share their own knowledge with the Aes Sedai and the likes of me. My good friend, Samwell Tarly, helped me gather accounts of several Westerosi commanders after Tarmon Gai'don and he shared with me his own experiences with Jon Snow, one of the five ta'veren himself - this was all vital to my work on The Dragon Reborn and I cannot but recommend his own account of events in Westeros after the Death of king Robert Baratheon, beautifully titled A Song of Ice and Fire. And thanks to what he told me about Westerosi history, especially the history of Targaryen dynasty, there was something very suspicious I noticed. In no way will I attempt to tell the history of Targaryen kings - for that, I recommend the writing of Archmaester Gyldayn, Fire & Blood, Being a History of the Targaryen Kings of Westeros, which was where I learned the most of Targaryen history.
King Maegor the Cruel, son of Aegon the Conqueror himself, was left forever known for his love of violence and war, and his failed marriages, which all resulted in him being without an heir. Though he displayed all these characteristics from a young age, his ambition to be kind does not seem to have been one of them - the witnesses of his exile in Pentos, one of the Slaver's Isles, record he was perfectly content with life there. It is only after he met a man who seemed to have come from Essos that he decided to return to Westeros as soon as his brother Aenys had passed away. This man was Eman Galladon, though he was remembered in history as the Black Snake instead. He was said to be a sorcerer of great power, and he always fueled Maegor's own cruelty. Though he was never made an official member of the Small Council, he was king Maegor's most trusted advisor and the one who convinced the king to always remarry and to deal with the Faith of the Seven in the most brutal ways. However, after the death of Maegor on the very Iron Throne, Eman disappeared without a trace.
Almost fourteen decades later, during the reign of Aegon IV, a man named Nordil, who was said to have looked extremely similar to Eman the Black Snake by those who heard the stories of witnesses before, was accepted by Aegon IV as the Master of Whisperers. A man of unknown origins had grown to such great power and privilege that he was called the "True Hand of the King", even though he never held the actual title. He is said to have been the one to always introduce Aegon's mistresses to him and, according to some, the one who actually started the rumors that Aegon's son, Daeron, was actually the product of an affair between Aegon's brother Aemon and Aegon's sister-wife Naerys. Reportedly, he was the one who stood beside king's deathbed, when Aegon made his final decree, legitimizing all his illegitimate children. Brynden Rivers, known as Bloodraven, became the trusted advisor of his half-brother Daeron, and had deep resentment for Nordil, calling him a monster beyond all others. After the death of Aegon IV, he took quick action to find Nordil and have him killed, but when he and his men went to find him, Nordil was gone.
Later on, barely thirty years before the events I myself was the witness of, lord Denys Darklyn of Duskendale held king Aerys II in long captivity. This act condemned him and his entire house to death, when Aerys was later finally rescued by his Hand, Tywin Lannister. The king, as stated before, ordered the cruel torture and death of the entirety of Darklyn house and court. Not a single person was spared, and in the house Hollard, close kin, only one young boy was spared. However, in Darklyn court itself, an important advisor of lord Denys was never found again when the royalists tried to find him, an advisor named Reyal, who is said to have been brought by Denys' wife from the Isles of Slavers. He was said to have been a magician and intelligent deceiver and he was the one who encouraged lord Darklyn to imprison the king and who oversaw his torture during the period of half a year.
Many will say I am jumping to conclusions based one vague coincidences, but I myself am convinced these people - Eman, Nordil and Reyal - were in fact one man, the greatest of the Forsaken himself, sowing chaos in Westeros just like he did in Essos during the days of Artur Hawkwing.
An excerpt from the writing of Loial, son of Arent, son of Halan, the Fourth Age.