Seachnasach (died 711) was the 17th king of the Uí Maine.
Events from the 8th century in Ireland.
Uí Maine, often Anglicised as Hy Many, was one of the oldest and largest kingdoms located in Connacht, Ireland. Its territory of approximately 1,000 square miles (2,600 km2) encompassed all of what is now north, east and south County Galway, south and central County Roscommon, an area near County Clare, and at one stage had apparently subjugated land on the east bank of the Shannon, together with the parish of Lusmagh in Offaly.
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Seachnasach's genealogy lists him as ten generations removed from Máine Mór, the founder of Uí Maine: "Sechnasaigh, mic Congail, mic Eogain, mic Comain, mic Brenaind Daill, mic Cairpri Feichine, mic Fearadaig, mic Luigdheach, mic Dallain, mic Bresail, mic Máine Móir." This includes him among the Clann Comain sept of the dynasty.
Máine Mór mac Eochaidh was the founder of the kingdom of Uí Maine.
During his reign Cellach mac Rogallaig won the battle of Corran, and in 710, Dluthach mac Fithcheallach, possibly a son of the previous king, "was burned."
Cellach mac Rogallaig was a King of Connacht from the Uí Briúin branch of the Connachta. He was the son of Rogallach mac Uatach, a previous king. He succeeded his nephew Muiredach Muillethan mac Fergusso as king in 702.
Corran is a barony in south Co. Sligo. It corresponds to the ancient túath of Corann.
The annals merely report his death. No details are given.
| Preceded by Fithceallach mac Flainn | King of Uí Maine 691–711 | Succeeded by Dluthach mac Fithcheallach |
