Óengus mac Mugróin
Irish monarch
About Óengus mac Mugróin
Óengus mac Mugróin was an Irish.
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. 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.
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Important facts
Frequently asked questions
Who was Óengus mac Mugróin?
Irish monarch
When did Óengus mac Mugróin die?
Óengus mac Mugróin died in 803.
What nationality was Óengus mac Mugróin?
Óengus mac Mugróin was Irish.
Sources & further reading
· Wikipedia: Óengus mac Mugróin
Cite this page
APA: Biography.guide. (2026). Óengus mac Mugróin. https://biography.guide/oengus-mac-mugroin/
MLA: "Óengus mac Mugróin." Biography.guide, https://biography.guide/oengus-mac-mugroin/.
Chicago: "Óengus mac Mugróin." Biography.guide. https://biography.guide/oengus-mac-mugroin/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
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