According to Iolo Morganwg's oft-quoted but generally incorrect "Iolo MSS" (see Historical Sources below), Illtud founded seven churches at the college, with seven enclosures, and appointed seven companies to each church, with seven cells for each company, and each company constituting a choir, with seven learned men in each cell. This would mean the college had around 2000 - 2400 students at any given time. Whether the college was ever this large has not been confirmed by archeological excavation, but many well-known Celtic saints are said to have attended the college, including St. David of Wales, Gildas the historian, Samson of Dol, St. Paul Aurelian, and Paulinus.