The two major centers for the "cultus" of Saint Constantine were the church in Constantine Parish and the Chapel of Saint Constantine in St Merryn Parish (now Constantine Bay), both in Cornwall. The former was established by at least the 11th century, as it is mentioned in Rhygyfarch's 11th-century "Life of Saint David". At this time it may have supported a clerical community, but in later centuries it was simply a parish church. The Chapel at Constantine Bay had a holy well, and was the center of its own sub-parish.