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The family of Rhodri Mawr Ap Merfyn the Great Prince of Wales claimed descent from Mailcun [MW Maelgwn Gwynedd], a contemporary of the author Gildas (5th or 6th century), whose exact chronology is uncertain. (The obituary of Maelgwn which appears in Annales Cambriae is a late fabrication, so the Annales Cambriae cannot be used to deduce a date for Gildas.) However, there are suspicious features in the early part of the pedigree (see, for example, Molly Miller, "Date Guessing and Pedigrees", in Studia Celtica 10/11[1975/6], pp. 96-109), and the part of the pedigree which can be considered reasonably certain begins with Iago, whose death is recorded in the Irish annals. All dates given here should be regarded as approximate.