Daeron II Targaryen, King of the Seven Kingdoms

From Asoiaf

Daeron II of House Targaryen, King of the Seven Kingdoms (regined 184 AL to 209 AL), was the son of Queen Naerys Targaryen with either Aegon IV Targaryen, King of the Seven Kingdoms or Aemon the Dragonknight.

Daeron succeeded Aegon IV on the throne.

He brought Dorne into the realm by wedding Princess Myriah Martell and in turn gave his own sister to the reigning Prince of Dorne.

They had four sons, among them Aerys I and Maekar I.

On his death his second son Aerys I became king.