About Cybi
Lived 483 – 555 (aged 71–72). Cybi was a Welsh priest.
Saint Cybi (Welsh), or Cuby (Cornish), 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'.
Life in Cornwall The vita of Cybi, found in two (Latin) forms written about 1200, is of very doubtful value, but may be right in making him the son of a Cornish noble who was princeps militae, at a court between the Tamar and the Lynher, possibly Gelliwig.
According to the 'Life of Saint Cybi', he was the son of Salomon, a 'warrior prince', generally thought to have been a King of Cornwall. In the 'Bonedd y Saint', his father's name is given the Welsh form, Selyf. His mother, Saint Wenna (Gwen ferch Cynyr), was sister to Saint Non.
He was raised as a Christian and, in early life, went on a pilgrimage to Byzantine Judea and Jerusalem. He was appalled at the Church in Israel and considered it an invader of Christ's land. In Judea, he found Jewish Christians and he became anointed by a Nazarene Christian who was a Jewish man descendant of Jesus's brothers. He arrived home to find that his father was dead and he was King of Cornwall. Cybi politely declined the throne and, instead, traveled through his kingdom, preaching to the people and building churches at Duloe, and Tregony.
Life in Wales Cybi then moved on to south Wales, founding churches at Llangybi between Usk and Caerleon in Monmouthshire, and Llanddyfrwyr-yn-Edeligion. According to legend, Cybi is supposed to have crossed the Bristol Channel with ten followers. The local duke, Edelig, son of Glywys, threatened to evict them from his land, but as he approached them he fell from his horse, which died, and he and his men became blind. Edelig then prostrated himself and gave his body and soul to God, and he and his attendants were immediately cured and the horse restored to life.
He eventually sailed for north Wales, settling at Llangybi on the Llŷn peninsula. Not far from the church is Ffynnon Gybi (English: St Cybi's Well), whose waters have long been believed to hold healing 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.
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Important facts
People in Cybi's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped Cybi's
Frequently asked questions
Who was Cybi?
Cornish-Welsh bishop and saint
When was Cybi born?
Cybi was born in 483 in Penmon.
When did Cybi die?
Cybi died on 8 November 555.
What was Cybi's occupation?
Cybi was a priest.
What nationality was Cybi?
Cybi was Welsh.
Sources & further reading
Cite this page
APA: Biography.guide. (2026). Cybi. https://biography.guide/cybi/
MLA: "Cybi." Biography.guide, https://biography.guide/cybi/.
Chicago: "Cybi." Biography.guide. https://biography.guide/cybi/.
Data last updated: 2026-09-20 · Spot an error? Report a correction.
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