John Seal's book includes an introduction that sets the scene, on the Romano-British period, with an account of the Celtic Church and early monasticism. He includes Glastonbury and its saints, Collen, Columba, David, Patrick, Paulinus; also Benignus, Briget, Beuno, the children of Brychan, the Cheddar saints, Congar, the saints of Blue anchor Bay, Gildas and Kea. The documentary sources, Gildas, the Anglo-Saxon Chronicle, Nennius, and William of Malmesbury, are given in an appendix.