"[3] Cynllo is variously described in the genealogical Bonedd y Saint as the son of Usyllt and brother of Teilo.

[5] Wade-Evans thought he should be identified with Kentinlau who accompanied Saint Cadfan from Brittany to Ceredigion.

[6] Cynllo's knee imprints, made as he said his devotions, are said to exist in a rock, near the farm Felin Gynllo, which lies just outside Llangoedmor in Ceredigion.

There is a church in Ceredigion commemorating Saint Cynllo at Llangynllo (said to stand on the site of his monastic cell)[9] and Nantcwnlle, and also the church of St Cynllo in the community of Nantmel in the historic county of Radnorshire, now part of Powys, and at Llangynllo west of Knighton.

[12] Cynllo does not appear on the Roman Catholic National Calendar for Wales, although every parish is encouraged to celebrate its patronal feast.