 Mylor was in medieval times in the episcopal manor and peculiar deanery of Penryn and was also the mother church of Mabe.In 1277 there was a dispute between the Bishop of Exeter and the Earl of Cornwall over sand and soil which was being carried away from the glebe land of Mylor by agents of the Earl.In 1278 this was settled by the Bishop lifting the threat of excommunication he had made and redistributing the large sum of money he had collected as custom duty for the sand and soil.