Irish monk and bishop. He became a monk at Landevenic (Brittany), the disciple of Paul Aurelian, and came with him to Britain. Later he succeeded him as bishop in Brittany. Joavan was buried at Plougen, where his tomb has survived, but not his relics. At least two Breton churches are dedicated to him. Feast: 2 March.
Stanton, pp. 95–8, which cites Lobineau, Saints de Bretagne, i. 177 and a calendar of St Paul's cathedral as sources for his cult.