
- 1740: He was ordained as a Deacon.
- 1743: He was in some trouble at the Bishop’s Court and consequently, the Bishop of St Davids refused to ordain him as a Priest.
- 1748: He married Mary Francis and went to live in his mother’s old home at Pantycelyn.
- 1749: The volume 'Aleluia' (Hallelujah) is published.
- 1756: The poem 'Golwg ar Deyrnas Crist' (A view of Christ’s Kingdom) appears.
- 1759: He published the English volume 'Hosannah to the Son of David'.
- He travelled and preached and held fellowship meetings across Wales throughout his life.
- During his career, he published many hymns such as 'Hosanna i Fab Dafydd' (Hosanna to the Son of David), 'Rhai Hymnau a Chaniadau Duwiol' (Some Hymns and Divine Songs), 'Caniadau y Rhai Sydd ar y Môr o Wydr' (The Songs of Those on the Crystal Sea) and 'Ffarwel Weledig' (Farewell Seen Things).
- These hymns were important, not only to the nation’s religious life, but as a valuable contribution to its literary culture.
- He also published a number of prose, such as 'Llythyr Martha Philopur', (Martha Philopur’s Letter) and 'Crocodil Afon yr Aipht' (Crocodile of the River of Egypt).
‘He was the first romantic poet in Wales, and, as such, he was a considerable influence, not only on his contemporaries but on his successors also.’ – Gomer Morgan Roberts, Dictionary of Welsh Biography