Battle of Bellaghmoon

Battle of Ballaghmoon
Date 13 September 908 Location Ballaghmoon, County Kildare, Ireland Result Decisive allied victory
Belligerents
Kingdom of Meath Kingdom of Leinster Kingdom of Connacht Kingdom of Osraige	Kingdom of Munster
Commanders and leaders
Flann Sinna Cerball mac Muirecáin Cathal mac Conchobair Cellach mac Cerbaill  †	Cormac mac Cuilennáin  †
Strength
Unknown	Unknown
Casualties and losses
unknown	unknown

The Battle of Ballaghmoon (Irish: Cath Bealaigh Mughna) took place on 13 September 908 at Ballaghmoon, near Castledermot in the south of modern County Kildare. It pitted the forces of Cormac mac Cuilennáin, king of Munster against a alliance comprising the forces of Flann Sinna, high king of Ireland, Cerball mac Muirecáin, king of Leinster, Cathal mac Conchobair, king of Connacht, and Cellach mac Cerbaill, king of Osraige. It ended in a decisive victory for the alliance led by Flann Sinna.

The Conflict arose after Cormac mac Cuilennáin assembled an army to campaign against his eastern neighbour, Leinster, whose king Cerball mac Muirecáin was Flann Sinna's son-in-law and staunch ally. After this hostile act Flann in an alliance with Cathal mac Conchobair, king of Connacht, led an army into Leinster in order to help his son-in-law. Despite the men of Munster being outnumbered and peace talks being held between both sides, Cormac refused to surrender, it ultimately proved to be his undoing, he and Cellach mac Cerbaill were killed during the course of the battle.

The war started when Cormac mac Cuilennáin and an adviser Flaithbertach mac Inmainén assembled an army to campaign against their eastern neighbours, Leinster, whose king Cerball mac Muirecáin was Flann Sinna's son-in-law and staunch ally. The Fragmentary Annals of Ireland, a source compiled in the 11th century for Donnchad mac Gilla Pátraic, king of Osraige, and king of Leinster, contain a long account of these events, perhaps written within living memory.

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