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Casserly Family HistoryThis is an anglicization of the Gaelic name O Caiside - a compound of the elements "O" meaning "grandson" or "male descendant" and the personal name Caiside (coming from "cas" - curly hair). The O'Cassidys belonged to County Fermanagh in the province of Ulster and they provided physicians to the Maguires (a name which means pale-coloured!) between 1300 and 1600. The (O)Cassidys also excelled in the field of literature. One Rory O'Cassidy, Archdeacon of Clogher, is said to have helped compile the 15th century "Annals of Ulster".
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