Óengus Mac Mugróin
Óengus mac Mugróin (died 803) was a king of the Uí Failge, a Laigin people of County Offaly. He was the son of Mugrón mac Flainn (died 782), a previous king. He ruled from 783 to 803. A conflict within the Uí Failge led to a slaughter in 789 at Cluain Ferta Mongáin (Kilclonfert, County Offaly) by Óengus at which his cousin Áed mac Tomaltaig was slain (their fathers were brothers). In 803 he was treacherously killed by the followers of Fínsnechta Cethardec mac Cellaig (died 808), over king of Leinster.AU 803.6; Byrne, pg.160 Finsnechta was ensuring his control of the church of Kildare which led to conflict with the Uí Failge. His grandson Máel Sinchill mac Mugróin (died 881) was a King of the Uí Failge. Notes See also * Kings of Ui Failghe Kings or King's may refer to: *Monarchs: The sovereign heads of states and/or nations, with the male being kings *One of several works known as the "Book of Kings": **The Books of Kings part of the Bible, divided into two parts ...
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County Offaly
County Offaly (; ga, Contae Uíbh Fhailí) is a county in Ireland. It is part of the Eastern and Midland Region and the province of Leinster. It is named after the ancient Kingdom of Uí Failghe. It was formerly known as King's County, in honour of Philip II of Spain. Offaly County Council is the local authority for the county. The county population was 82,668 at the 2022 census.
Central Statistics Office figures

Geography and political subdivisions

Offaly is the 18th largest of Ireland's 32 counties by area and the 24th largest in terms of population. It is the fifth largest of Leinster's 12 counties by size and the 10th largest by population.

Physical geography

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