Prince Aegon Blackfyre was Daemon I Blackfyre's eldest living son and the older twin of Aemon. He was pierced by a volley of arrows loosed by his half uncle Brynden Rivers. His death was to stop Daemon from continuing to fight in the battle and Brynden knew that Daemon would not leave his eldest son while a drop of blood still ran in his veins nor did he. This of course resulted in Daemon's death and the end of the first Blackfyre rebellion.