Saint Cybi, or Cuby, was a 6th-century Cornish bishop, saint, and, briefly, king, who worked largely in Cornwall and North Wales: his biography is recorded in two slightly variant medieval 'lives'.
Mural of Cybi in Holyhead, Anglesey by artist Gary Drostle
Holy Island is an island on the western side of the larger Isle of Anglesey, Wales, from which it is separated by the Cymyran Strait. It is called "Holy" because of the high concentration of standing
Cybi
…properties. 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. Cybi…