Jaehaerys I Targaryen, King of the Seven Kingdoms

From Asoiaf

Jaehaerys I of House Targaryen, King of the Seven Kingdoms (reigned 48 AL - 103 AL), called the Old King and the Conciliator, was the son of Aenys I Targaryen, King of the Seven Kingdoms.

Jaehaerys succeeded his uncle Maegor I on the throne.

On Jaehaerys' death, his grandson Viserys I became king.