[1] His father was chief of the clan and his mother was Nuala, daughter of Lochlann O’Rourke, the King of East Breifne O’Ruairc from 1435 to 1458.
Éamonn’s brothers were Cathal, Maghnus, Aodh, Fearghal, Uaithne and Tadhg.
During Éamonn's lifetime he was involved in an internal power struggle within the McGovern clan.
There was internecine warfare between the McGovern clan and the reigning chief, Domhnall ‘Bernach’ Mág Samhradháin, who was slain on 15 February 1496 by Éamonn’s nephews and others in Templeport Church.
And the town of Mag Samradhain (Ballymagauran) was burned by them and they turned back and came not on cattle-spoils or chattels.
And the worthies of the country overtook them on that retreat with a very large pursuing party and those nobles turned on the pursuing party and defeated them spiritedly, successfully then and slew three and twenty of the pursuing party in that rout, two sons of Aedh, son of Eogan Mag Samradhain, namely, Tadhg and Maghnus (that is, the cleric).