 The hymn "Dyma Feibil annwyl Iesu" ("This is Jesus’ Precious Bible") has been attributed to her given that it was written in her handwriting in one of her books, but the attribution is uncertain because Thomas sometimes copied down hymns from other sources.Thomas's hymns have been described as "powerful and by no means conventionally feminine".Thomas was married twice, first to Edmund Williams and then, around 1817, to Edward Thomas.