There has been a Christian presence on this site from the time of Saint Teilo in the 6th century, and the present building dates from the Norman period, around 1120.
Bu presenoldeb Cristnogol ar y safle hwn o adeg Teilo Sant yn y 6ed ganrif, ac mae'r adeilad presennol yn dyddio o gyfnod y Normaniaid, tua 1120.