Nuada

Nuada of the Silver Hand, King of Tir Na Nog and of The Tuatha De Danaan.
First appeared in Season 2
Nuada and most of the rest of the Tuatha De Danaan were under the spell of Saint Patrick, who had convinced them they were sinful pagans and should worship Yahweh above all else.
Fionn Corvin killed Saint Patrick, freeing them from the curse and Nuada said he would be forever welcome in Tir Na Nog from that day forward.