The territory of the O'Duibhir sept, from which the DEVERS, O'DEERE, O'DUVRE, DWYERS and O'DWYERS descend, was located in the baronies of Kilnamagh Upper and Lower in western county Tipperary. At the end of the last century Dwyer, without the prefix 'O' was six times as prevalent as O'Dwyer, but this is one of the surnames where the majority have reassumed the prefix. Members of the families are still to be found in numbers in County Tipperary, and have dispersed mainly to County Limerick and Cork and County Kilkenny. The inland Munster county of Tipperary is second only in extent in Ireland to the Ulster county of Donegal, covering as it does over one million acres. The county is bounded on the east and north-east by the province of Leinster, having boundaries with the counties of Offaly, Leix and Kilkenny. On the south side County Tipperary has a boundary with County Waterford, marked for some distance by the River Suir. The community which mushroomed beside one rich colliery, which opened in the 18th century, one of the earliest to be exploited in the county, was named Coalbrook. Ironstone metal was also found in the pits there. As this county covered a large territory it accommodated anciently a number of septs; by the time of the arrival of the Anglo-Normans, branches of several Dalcassian septs from Thomond had also established themselves in the area. At first the surname was formed by prefixing Mac to the father's christian name or O to that of a grandfather. They were a Sept seated at Muintir-Duibhidhir, a district in the present Barony of Kilnamanagh, County Tipperary, deriving their name from Duibhidhir, Chief of the Sept. The Four Masters record that Thomas O'Dwyer, son of Conor, son of Thomas O'Dwyer of Ormonde, was slain by the O'Kennedy's in the year 1473. Ireland was one of the earliest countries to evolve a system of hereditary surnames. They came into being fairly generally in the 11th century, and indeed a few were formed before the year 1000. The associated coat of arms is recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884. Registered in Ireland.
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