He is sometimes credited with the legal treatise Britton; but in its current form Breton cannot be the author as the work refers to laws written 15 years after the bishop's death.
[3] The elder Breton, who is sometimes styled William Brito in records, came from a family who often served as justices and other legal officials.
A notation next to the debt implies that he was a canon of Hereford Cathedral at this point,[1] but the Fasti Ecclesiae Anglicanae 1066–1300 does not identify him as such.
[5] Breton does not appear in the records from this point until after the Battle of Evesham in 1265, when he is noted as holding a grant of royal safeguarding.
[7] A number of chronicles that mention Breton's death also note that he was the author of a legal treatise entitled le Bretoun, but this cannot be the surviving work called Britton, at least not in the current form, as that work discusses laws composed 15 years after Breton's death.