Isaac Pask was born c1705, although it is not sure where he was born, and who he married. He is the main progenitor in Monmouthshire. He lived in Cwmcarvan and Llanvihangel-ystern-Llewern, Monmouthshire. Little is known about him, except that he had two sons, Isaac (1715), and William (1732). He has 900+ descendants. It is believed that all Welsh PASKs descend from Isaac.