Eógan mac Muiredaig is named in some Scots

Scotland

Scotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...

 sources as a king of Dál Riata

Dál Riata

Dál Riata was a Gaelic overkingdom on the western coast of Scotland with some territory on the northeast coast of Ireland...

, probably in the 730s.

Presumed to be the son of Muiredach mac Ainbcellaig

Muiredach mac Ainbcellaig

Muiredach mac Ainbcellaig was king of the Cenél Loairn, and of Dál Riata , from about 733 until 736.He was the son of Ainbcellach mac Ferchair. His coming to power is reported in 733, and is not obviously associated with the death of Eochaid mac Echdach, king of Dál Riata, in the Irish annals...

, and thus a king of the Cenél Loairn, Eógan is not named in any surviving Irish annals

Irish annals

A number of Irish annals were compiled up to and shortly after the end of Gaelic Ireland in the 17th century.Annals were originally a means by which monks determined the yearly chronology of feast days...

, nor does he appear in the Duan Albanach

Duan Albanach

The Duan Albanach is a Middle Gaelic poem found with the Lebor Bretnach, a Gaelic version of the Historia Brittonum of Nennius, with extensive additional material ....

, which passes from Muiredach to Áed Find

Áed Find

Áed Find or Áed mac Echdach was king of Dál Riata . Áed was the son of Eochaid mac Echdach, a descendant of Domnall Brecc in the main line of Cenél nGabráin kings....

. The Chronicle of the Kings of Dál Riata names Eógan son of Muiredach as king after Muiredach, and the king-list in the Chronicle of Melrose

Chronicle of Melrose

The Chronicle of Melrose is a medieval chronicle from the Cottonian Manuscript, Faustina B. ix within the British Museum. It was written by unknown authors, though evidence in the writing shows that it most likely was written by the monks at Melrose Abbey. The chronicle begins on the year 735 and...

 includes him.

Later genealogies of the Mormaers of Moray

Mormaer of Moray

The Mormaerdom or Kingdom of Moray was a lordship in High Medieval Scotland that was destroyed by King David I of Scotland in 1130. It did not have the same territory as the modern local government council area of Moray, which is a much smaller area, around Elgin...

 trace their descent from the Cenél Loairn through one Ruadrí, a presumed brother of Eógan's father.

Eógan's reign falls in the period when Dál Riata was invaded and conquered by the Picts

Picts

The Picts were a group of Late Iron Age and Early Mediaeval people living in what is now eastern and northern Scotland. There is an association with the distribution of brochs, place names beginning 'Pit-', for instance Pitlochry, and Pictish stones. They are recorded from before the Roman conquest...

 under Óengus mac Fergusa

Óengus I of the Picts

Óengus son of Fergus , was king of the Picts from 732 until his death in 761. His reign can be reconstructed in some detail from a variety of sources.Óengus became the chief king in Pictland following a period of civil war in the late 720s...

. The name of his successor is unknown, and the next king to appear in the record is Áed Find of the Cenél nGabráin, some three decades after Eógan's time.