In his personal arms, he reversed the colors of the Targaryen Coat of Arms: they depicted a black three-headed dragon on a red field. He founded House Blackfyre (named after the sword), and all of his successors bore his arms. He was the most important of the bastard sons of Aegon IV his father also gave him Blackfyre, the sword of Aegon I, that was considered the real royal heirloom, a symbol of the royalty itself more than a crown.īecause of this, he was a pretender to the throne, contesting the succession and legitimacy to rule of Daeron II. The most famous bastard sons of House Targaryen were the Great Bastards of Aegon IV in his deathbed, the King legitimized them all, causing five major rebellions and more than sixty years of troubles all the males had a personal Coat of Arms derived in part of the standard Targaryen three-headed dragon.
I'm focusing my answer on bastard sons Aegon's answer has covered pretty much all the legitimate Targaryens, there is no point to duplicate information
