Born in 172 AL, Aegor Rivers was a natural son of King Aegon IV Targaryen by his fourth mistress, Lady Barba of House Bracken. When King Aegon IV took as his fifth mistress, Mylessa Blackwood, her elevation came at the expense of Barba and Aegor. This situation was only exacerbated by the birth of Mylessa's son by the king, Brynden Rivers, in 175 AL. The centuries' long enmity between House Bracken and House Blackwood further ensured that Aegor and Brynden Rivers, later known as "Bloodraven", would become bitter rivals.
Aegor, like all of Aegon IV's bastards, was legitimized by the King on his deathbed in 184 AL. His personal sigil was a red stallion with black dragon's wings snorting flame, on gold.
The Blackfyre RebellionEdit
Aegor, nicknamed "Bittersteel", took the side of his elder half-brother Daemon Blackfyre when Daemon claimed the Iron Throne for himself in 195 AL. At the Battle of the Redgrass Field, Bittersteel fought alongside the rebel forces. After the death on the battlefield of Daemon Blackfyre and his twin sons, Bittersteel picked up the fallen sword, Blackfyre, and turned the rout of the rebel forces into a "mad charge" against the royalists. This brought him face to face with Bloodraven, and the two half-brothers fought a vicious duel in which Bittersteel cut out one of Bloodraven's eyes.
The Golden CompanyEdit
Escaping the Redgrass Field, Bittersteel led a remnant of the rebel army and Daemon Blackfyre's five surviving sons to the Free Cities. He eventually founded the Golden Company, a famous and powerful sellsword company, one of whose mottos was "Beneath the gold, the bitter steel." At the head of the Golden Company, Bittersteel led at least two more rebellions against House Targaryen.