Aegon V Targaryen, King of the Seven Kingdoms
From Asoiaf
Aegon V of House Targaryen, called the Unlikely, King of the Seven Kingdoms (reigned 233 AL - 259 AL), was the fourth son of Maekar I Targaryen, King of the Seven Kingdoms.
He succeeded his father on the throne.
On his death his second son Jaehaerys II became king.