Muirchertach mac Muiredaig (died c. 534), called Mac Ercae, Muirchertach Macc Ercae and Muirchertach mac Ercae, was said to be High King of Ireland in the 6th century. The Irish annals contain little reliable information on his life, and the surviving record shows signs of retrospective modification. The Aided Muirchertaig Meic Erca takes as its theme Muirchertach's supernatural death.