Born at Tŷ Mawr Wybrnant in the Conwy valley, William Morgan studied at Cambridge and became vicar of Llanrhaeadr-ym-Mochnant. There he translated the whole Bible into Welsh, published in 1588 under an Act of Parliament of 1563.
His translation gave the Welsh a dignified, standard written language at a time when English was the language of law and government. He later became Bishop of Llandaff and then of St Asaph. Tŷ Mawr Wybrnant is now cared for by the National Trust.
Ganed William Morgan yn Nhŷ Mawr Wybrnant yn Nyffryn Conwy. Astudiodd yng Nghaergrawnt a daeth yn ficer Llanrhaeadr-ym-Mochnant. Yno cyfieithodd y Beibl cyfan i’r Gymraeg, a gyhoeddwyd yn 1588 dan Ddeddf Seneddol 1563.
Rhoddodd ei gyfieithiad iaith ysgrifenedig safonol ac urddasol i’r Cymry ar adeg pan oedd Saesneg yn iaith y gyfraith a’r llywodraeth. Daeth yn Esgob Llandaf ac yna Llanelwy.