About Einion Sais ap Dafydd
Einion, son of Davydd. Einion Sais was usher, or chamberlain, of the Palace of Sheen (Richmond) to Henry VI. (temp. 1413—1471) and so was called "Sais," i. e. "Saxon," on account of his being so much in England. He fought in the wars of Henry V., by whom his coat-of-arms was augmented. He was succeeded by his son—Heylin, of Bodorgan, (Heylin ap Einiawn, Esq., was living 1465)
(1) A Genealogical and Heraldic dictionary of the Landed Gentry of Great Britiam and Ireland for 1853, Sir john Bernard Burke, Esq., Published by Hurst and Blackett, 13 Great Marlbouought St., England, 1853, Page 862.