Under the likes of Deiniol, Cedifor, Morgan ap Rhys and Dafydd ap Owain the busy monks wrote or copied some of the central Welsh texts of the day.
O dan Deiniol, Cedifor, Morgan ap Rhys a Dafydd ap Owain a’u tebyg, byddai’r mynachod prysur yn ysgrifennu neu’n copïo rhai o destunau Cymraeg canolog y dydd.