Irish saint. His cult is centred in Taranto (S. Italy) and extends over Italy, Sicily, and Malta; it can be traced back as far as 1071 when his relics were discovered at Taranto. Inside the coffin was the head of a pastoral staff of Irish workmanship with the inscription Cathaldus Rachau: all attempts to discover this last place-name have so far failed. The cult flourished under Norman and Benedictine influence: a painting of Catald survives in the basilica of the Nativity at Bethlehem and 12th-century mosaics in Palermo and Monreale. No doubt Catald is an example of the many Irish monks, otherwise unknown, who chose exile for the love of Christ in the early Middle Ages. He is invoked against plagues, drought, and storms. Feast: 10 May.
AA.SS. Maii II (1680), 569–78;J. Hennig, ‘Cathaldus Rachau’, Medieval Studies (1946), pp. 217–44;The Irish Saints, pp. 61–2.