IRISH HERITAGE DATES OF RELEVANCE FOR IRISH & ANCESTRAL IRISH PEOPLE 432 ......Traditional date of St Patrick’s mission to Ireland. Feast day 17th March 493 ...... Reputed date of St Patrick’s death (Wednesday 17th March) 546 ....... Derry founded by St. Colum 547/8 .... Clonmacnoise, Co. Westmeath founded by St. Ciaran (Now established visitor Centre)…