 He eventually sailed for north Wales, settling at Llangybi on the Llŷn peninsula.Off Anglesey, King Maelgwn Gwynedd gave him the old Roman fort at Holyhead (subsequently known, in Welsh, as Caer Gybi, "Cybi's Fort") on Holy Island (thence called "Ynys Gybi", "Cybi's Island").He founded a large and important monastery there in the area where St Cybi's Church is now located.