There is no historical or archaeological evidence placing St. Nicholas's burial in Ireland.
The 4th-century Bishop of Myra died c. 343 AD and was interred in his cathedral, the Church of St. Nicholas in Myra (modern Demre, Antalya Province, Turkey).
The Irish connection likely stems from later medieval relic dispersal or confusion with local saints. The saint's historical tomb is unequivocally in Turkey.