St Gwynno the Saint
St Gwynno was trained in Llantrisant "the church of the Three Saints" who was considered to be a patron in conjunction with St Illtyd and Tyfodwg. He was likewise the patron of Vaynor, formerly Maenor Wyno in Breconshire. The saint's holy well Ffynnon Wyno is near Llanwynno church.

Daerwynno is not far from the old church, Gwynno probably lived in this farmhouse and may have owned the land around, together with some part of Mynydd Gwyngul, which he left either to the church or the poor of the parish; but this, like other things, may have changed with time. Moreover, it is significant that the nearest farmhouse to the church has been ever since been known as ‘Daerwynno’- Gwynno’s Land. It does not say whether the land belongs to Gwynno the Saint or the church or the poor of the parish.