Dál Uí Chathasaigh

Dallyhaysy preserves the memory of the Ó Cathasaigh family, powerful Gaelic lords who ruled Saithne in north County Dublin until the Anglo-Norman invasion. The name's etymology—Dál (tribe) + Uí Chathasaigh (genitive of O'Casey)—reflects this territorial significance. Iomhar Ua Cathasaigh, the last recorded lord of Saithne, died in 1179, coinciding with Anglo-Norman conquest. Sir Hugh de Lacy ra...