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The Life of St.Oudoceus (Translation) from the Book of Llan Dâv (see Other Works) makes Mouric a contemporary of Oudoceus and the Yellow Plague of Britain. The latter is dated to 547 CE by the Annales Cambriae (see Other Works). Plainly, though, Saints' lives vary tremendously in how much faith one would put in them.

The genealogy for the kings of Gwent exists in three slightly different forms in three separate manuscripts*. The oldest, which is found attached to the Historia's Harleian 3859 Manuscript (Manuscript A), gives (with dates from Kirby*):

...Teudubric - Mouric - Atoys - Morcant - Iudhail [alive 716-757] - Fernmail [d.775] - Atroys - Iudhail [d.848]

(NB1: Note that the date at the end of this matches a date for the compilation of the Historia of 830 if it is assumed Iudhail [Ithel] was alive when added to the end of the genealogy [See Dating Note]; note also the consistent spelling of Mouric both in the Wonder and the genealogy [See Alternatives Note]. NB2: Some have suggested that Atoys [Adroes/Athrawes in the other manuscripts / Athrwys in the Book of Llan Dâv (See Other Works)] is the legendary Arthur, though the evidence is limited).

The other two genealogies include an earlier Meuric/Meurig, at least five generations before Tewdric. This is unlikely to be our Meuric if the Wonder refers to Mathern, as it is plain that the Book of Llan Dâv, at least, places Tewdric's son who handed over the land at ~550 CE : both the Meurig that welcomes Oudoceus to his land in ~550 and Tewdric's son are married to a woman called Onbrawst, connecting the Oudoceus date to the period of the land gift by Tewdric's son. Davies* notes that Meurig is recorded as the son of Enynny [Henfyn/Enhinti] in the Harleian manuscript 2414(fo.59v) and the Life of St.Cadoci. Enynny was the sister of Urien Rheged (Info), which would put Meurig in the 6th C., however the Jesus College manuscript 20(9) gives this mother to the earlier Meurig so there is some confusion*. There were also at least two other king Meurigs in the area much later, reigning c.848-874 (Meurig ap Arthfael) and c.1035-1065 (Meurig ap Hywel)*.

Assuming the standard 30 years per generation, the genealogy above gives Tewdric as alive between c.596 and 637, and Mouric as alive between 626 and 667. On the basis of the same assumption and the dating implicit in the Book of Llan Dâv Davies suggests c.555-625 and c.585-665 respectively*. Neither estimates for Mouric obviously match the date for the Yellow Plague of 547. Other Suggested dates for Tewdric's death range from 470 CE, which Thomas* suggests is given as the date on a plaque at Tewdrick's well (The plaque couldn't be found in 2005: see Visit Details) to 610 CE*.

As a footnote, genealogies in the 12th C. Life of St. Cadog* tie this family to the family of Cunedda Wledig (and therefore, somewhat dubiously, Arthur), as well as the mythical forefathers/mothers of the British/Welsh rulers. For more details see the genealogy of Arthur's sons from the Wonder 13 pages, plus this English Translation of the Life.