Burke's Peerage & Baronetage
Seward; feudal Lord of Sutton, Holderness, Yorks; allegedly living 1066, more probably at the time of the Domesday Survey 21 years later; alleged ancestor of [Roland, of Sutton-on-Trent, living c1220].
The cited information was sourced from Book, edition 106th of published in 1999 edited by Charles Mosley