founder but not patron of Luxulyan (Cornwall), abbot. Probably identical with Sulien, a Breton saint of Cornouaille and Domonée. Feast: 29 July.
Much confusion has arisen with another Breton saint Sulinus of East Brittany (feast: 1 October) and with a Welsh saint Tysilio (or Suliau), whose feast is on 8 November, and whose Legend was pirated for a Breton saint. It is likely that the three feasts represent three different persons.
G. H. Doble, The Saints of Cornwall, v (1970), 104–26.