Mybbard (Mewbred or Mebbred),also known as Calrogus was a 6th century hermit and is a local Cornish saint[1] said to be the son of a King of Ireland.

Very little is known of his life though he is recorded as having been beheaded, with two others, by the pagan ruler Melyn ys Kynrede in what is today the parish of Lanteglos-by-Fowey, near Fowey,[2] Cornwall.

He was abbot at Caer Gybi, Holyhead, Anglesey and worked with Saint Cybi of Caernarvon.

Mancus is said, on the authority of Robert Bracey, to lie in the church of Lanreath, two miles from Fowey.

William of Worcester prefaced the account of the three martyrs by the sentence "there were three brothers under the name of St. Genesius and each carried his head, one of them archbishop of Lismore.