Sechnassach mac Colggen (died 746/747) was a king of the Uí Cheinnselaig of South

Leinster Leinster ( ; or ) is one of the four provinces of Ireland, in the southeast of Ireland. The modern province comprises the ancient Kingdoms of Meath, Leinster and Osraige, which existed during Gaelic Ireland. Following the 12th-century ...

or Laigin Desgabair. He was of the Sil Chormaic sept of this branch of the Laigin. His father Colcú mac Bressail (died 722) was called king of Ard Ladrann (near

Gorey Gorey () is a market town in north County Wexford, Ireland. It is bypassed by the main N11 road (Ireland), M11 Dublin to Wexford road. The town is also connected to the Gorey railway station, railway network along the same route. Local newspape ...

County Wexford County Wexford () is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Leinster and is part of the Southern Region, Ireland, Southern Region. Named after the town of Wexford, it was ba ...

) at his death obit in the annals in 722 which mention that he was killed. Sechnassach was the great-great grandson of Crundmáel Erbuilc (died 655), a King of Leinster and brother of

Áed mac Colggen Áed mac Colggen (died 738) was a king of the Uí Cheinnselaig of Leinster. Some sources incorrectly make him joint king of Leinster with Bran Becc mac Murchada, but it appears that Áed was main ruler of Leinster in 738. His father Colcú mac ...

(died 738), also King of Leinster. His brother had been slain at the Battle of Áth Senaig in 738 by the high king

Áed Allán Áed Allán (or Áed mac Fergaile) (died 743) was an 8th-century Irish king of Ailech and High King of Ireland. Áed Allán was the son of Fergal mac Máele Dúin and a member of the Cenél nEógain, a branch of the Northern Uí Néill. Ferga ...

. After the crushing defeat at Áth Senaig, the Uí Dúnlainge dominated the kingship of Leinster for fully three centuries. He succeeded his brother as king and ruled from 738-746/ 747. Nothing is recorded of him in the annals other than his death.
Annals of Ulster
', AU 746.10, 747.4;

', AT 746.9, 747.5 His nephew

Eterscél mac Áeda Eterscél mac Áeda (died 778) was a king of the Uí Cheinnselaig of South Leinster. He was of the Sil Chormaic sept and was the son of Áed mac Colggen (died 738), considered to be King of all Leinster. His uncle Sechnassach mac Colggen (died 746/ ...

(died 778) was also a King of the Uí Cheinnselaig.

References

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External links

CELT: Corpus of Electronic Texts
a
University College Cork
Kings of Uí Cheinnselaig 8th-century Irish monarchs 740s deaths People from County Wexford People from County Carlow Year of birth unknown {{Ireland-royal-stub