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Brennan crestThis is one of the most frequent surnames in Ireland. It derives from the two Irish originals O'Braonain and Mac Branain . The Mac Brandin were chiefs of a large territory in the east of the  present Co.Roscommon and the majority of the Brennans of north Connacht, counties Mayo, Sligo and Roscommon descend from them. O'Braonain originated in at least four distinct areas: Kilkenny, East Galway, Westmeath and Kerry. Of these the most powerful were the O'Braonain of Kilkenny, chiefs of Idough in the north of the country. After they lost their land to the English, many of them became notorious as leaders of the outlaw bands. A separate family, the O'Branain, are the ancestors of many Brennans of counties Fermanagh and Monaghan where the name was also anglicised as Brannan and Branny.

The Brennan Clan came into existence over a thousand years ago when Braonan, the son of Cearbhall, Viking King of Dublin, settled in the area of north Kilkenny, then known as Idough. Until the coming of the Normans in the 12th century the Brennans were the most powerful clan in the area, having defeated all local opposition.

In the 17th century the Brennan lands were granted to Christopher Wandesforde and the Brennans lost all legal rights to their land.

Since then Brennans have left Ireland and settled every corner of the world. In 1990 the first Clan Gathering was in Castlecomer where hundreds of the descendants of those Brennans came back to the land their forefathers.

Welcome to our Clan Agnew page. Click on this graphic if you'd like to get our welcome tour of the site.



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