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FITZSIMON Family HistoryThis interesting name is of Medieval Irish-Norman origin, although it is also widespread in England, and is the patronymic form (Fitz denoting 'son of') of the Old Norse personal name 'Sigmundr', a name meaning victory. The first records of this name in Ireland are of a period after the Anglo-Norman Invasion of 1170, and among the Norman families brought to County Down by John de Courcy in 1177 were some called Fitzsimon, while others followed the Prendergasts to Mayo early in the next century. The most important line of this family came to Ireland from Simonshide in Hertfordshire and settled in The Pale (an area in Dublin) in 1323, since then they have been leading gentry in Counties Dublin and Westmeath...
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