Baelor I Targaryen, King of the Seven Kingdoms

From Asoiaf

Baelor I of House Targaryen, King of the Seven Kingdoms (reigned 161 AL - 171 AL), called the Beloved and the Blessed, was the second son of Aegon III Targaryen, King of the Seven Kingdoms.

Baelor succeeded his older brother Daeron I on the throne. He was a septon.

On Baelor's death his younger brother Viserys II became king.