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'.

The Church of St Cybi, Llangybi, Monmouthshire is a parish church with its origins in the 13th or 14th century. Refurbished in the 15th century, the church was restored in 1909–10. The interior has a