Overview

Muirgeas was a grandson of Cú Ceanain mac Tadhg

Cú Ceanain mac Tadhg

Cú Ceanain mac Tadhg, Prince of Uí Díarmata, ancestor of the Concannon family, died 991-Background:Cú Ceanain mac Tadhg was a member of the Síl Muiredaig dynasty, who ruled as kings of The Connachta in what is now central County Roscommon. By the mid 10th-century they had expanded south-west into...

, and seems to have reigned from 1021 to 1037. He was the first member of the Uí Díarmata dynasty to use the name ua Cú Ceanainn in a quasi-surname context. All subsequent kings and lords of Uí Díarmata, to the end of the 16th century, would use it as a surname, latter-day Concannon.

Events of his reign in Connacht

Connacht

Connacht , formerly anglicised as Connaught, is one of the Provinces of Ireland situated in the west of Ireland. In Ancient Ireland, it was one of the fifths ruled by a "king of over-kings" . Following the Norman invasion of Ireland, the ancient kingdoms were shired into a number of counties for...

 and Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 included:

• 1022 - Death of High King
  High king
  A high king is a king who holds a position of seniority over a group of other kings, without the title of Emperor; compare King of Kings.Rulers who have been termed "high king" include:...
  
   Máel Sechnaill mac Domnaill
  Máel Sechnaill mac Domnaill
  Máel Sechnaill mac Domnaill , also called Máel Sechnaill Mór, Máel Sechnaill II, anglicized Malachy II, was King of Mide and High King of Ireland...
  
  .The Norse of Dublin were defeated by the Ulaid
  Ulaid
  The Ulaid or Ulaidh were a people of early Ireland who gave their name to the modern province of Ulster...
  
   in a naval engagement. Very great showers of hail fell in the summer, the stones of which were the size of wild apples; and great thunder and lightning succeeded, so that men and cattle were destroyed throughout Ireland.
• 1023 - The Termon of Cluain-mic-Nois was plundered by Gadhra Mór mac Dundach
  Gadhra Mór mac Dundach
  -Biography:Gadhra Mór was one of three known sons of Dundach, chief of the region extending from Grian to Caradh. The others were Diarmaid and Cú Connacht mac Dundach . He became chief of Síol Anmchadha in 1008, and all of Uí Maine after 1014...
  
  , and carried off many hundred cows from thence. King Tadg in Eich Gil of Connacht, fought a war in Uí Briúin
  Uí Briúin
  The Uí Briúin were an Irish kin-group. Their eponymous apical ancestor was Brion, son of Eochaid Mugmedon and Mongfind, and an elder half brother of Niall of the Nine Hostages. They formed part of the Connachta, along with the Uí Fiachrach and Uí Ailello, putative descendants of Eochaid Mugmedon's...
  
  
• 1032 -An eclipse of the sun on 31 August.Death of Mughron Ua Nioc, Abbot of Tuam
  Tuam
  Tuam is a town in County Galway, Ireland. The name is pronounced choo-um . It is situated west of the midlands of Ireland, and north of Galway city.-History:...
  
  .
• 1034 - Dubhdaingean, lord of Connaught, was slain by the Connaughtmen themselves.