From the prologue to The Eye of the World, (the first of the Wheel of Time books by Robert Jordan) this is Lews Therin Telamon also known as Lews Therin Kinslayer, the Dragon, who lead an assault on the Dark One before the Breaking of the World. Most unfortunately, he was corrupted by the Dark One's taint on saidin, the male half of the True Source, and was driven mad, murdering his family and beginning the Breaking of the World. This is just after The Forsaken, Elan Morin Tedronai, The Betrayer of Hope,used Shai'tan's Healing to restore Lews' memory of what he'd done. He Traveled to and open plain near Tar Valon, and consumed himself with the True Source, and Dragonmount soared up underneath him. ...pretty depressing ain't it?