From Encyclopedia of Heraldry by John Burke and John Bernard Burke (1844)
“Lord of Isdulas, Founder of the X. Noble Tribe. Vert, a cross flowery or.”
It does seem likely that someone named Braint Hir did, in fact, exist, although when is not completely clear. It seems most likely he was alive in the late ninth century (possibly born circa 880), although several sources place him much earlier, near the end of the sixth and early seventh centuries. However, it is probable that the earlier date is a misunderstanding based on a bad translation of the Historia Regum Britanniae. (Obviously, the arms depicted by the Burkes are spuriou. He must have died well before the documented use of heraldry in Wales – even the later date doesn’t get him that far. Besides, I’m not at all confident that there are credible sources for the arms of someone who doesn’t have a definitive birth and death date.
Blazon: Argent on a cross flory sable between in chief dexter two swords in saltire and sinister two keys in saltire, both azure and gules, five bezants
Crest: On a mural crown or a fountain between a branch of oak leaved and fructed and a branch of beech slipped proper
Supporters: On the dexter a lion sable and on the sinister a horse argent each with a cross formy fitchy pendant from a collar counterchanged
Mantling: Sable lined argent
Motto: Ad summa nitamur (Let us strive for perfection)
The cross flory comes from the arms of John Whitgift, Archbishop of Canterbury, by way of the County Borough of Croyden. The keys and swords refer to the Abbey of St. Peter and St. Paul. The fountain symbolizes the source of the River Wandle, and the white horse is from the arms of the Earls of Surrey.
Blazon: Per pale I vert a bend issuant from the mouths of two wolves or, langued gules and armed argent, all within a bordure of the last charged with the motto “Ave Maria Gratia Plena” sable; II per fess vert a tower or windowed azure and or a cross flory gyronny sable and argent
Blazon: Per fess or three trees issuant from a base vert and per pale i argent a cross flory gules charged with five escallops of the field, in base three barrulets wavy azure and gules three fleurs-de-lis in saltire argent