In 518 he welcomed the Irish monk, St Petroc, who was seeking to found a monastery in the area, which he did near Padstow.
Petroc himself would have lived much later than King Arthur; however, his namesake St Petroc, with which he is often confused, was described as one of the seven survivors of the Battle of Camlann according to Evan Evans’ copy (Panton MS 13) of the 17th-century Peniarth 185 manuscript.
The merger of North and East Devon Colleges led to them being re-branded under the name Petroc.
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In Wales his name is commemorated at St Petroc near Pembroke, Ferwig near Cardigan and Llanbedrog on the Lleyn peninsula.
In the first novel she has a pet rock called Petroc Trelawney (presumably named after Petroc Trelawny), which she loses when the Marram Marshes are flooded; she later acquires a pet duck called Ethel.