I wondered whether you might be interested in the modest information I have on Peredur: Peredur was the seventh son of Effrac. The text of the same name can be found in "Text of the Mabinogion and other Welsh tales from the red book of Hergest", (eds) J.G. Evans and Sir John Rhys, Oxford, 1887. By the way, the stories of Peredur, Kulhwch, Ronabwy and Owein are available in machine-readable form from the Oxford Text Archive, Oxford University Computing Services, 13 Banbury Road, Oxford (ARCHIV@UK.AC.OXFORD.VAX). Note that there is usually a small administrative fee for the texts and certain texts are available only with the written authorisation of the depositor. I hope this helps. Andrea Davies Artificial Intelligence Group Dept of Mathematical and Computing Sciences University of Surrey Guildford