|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 11, page 103 (as corrected in volume 14):
He [William (de Ros), Lord Ros (d. 1414)] m. (lic. 9 Oct. 1394) Margaret, da. of Sir John DE ARUNDEL [1st LORD ARUNDEL] (d. 1379), by Eleanor, yr. da. and coh. of John (MAUTRAVERS), LORD MAUTRAVERS (d. 1364), which Eleanor, about 1397, became de jure, according to modern doctrine, suo jure BARONESS MAUTRAVERS.
Eleanor was the daughter and coheir of John Mautravers (d. 1348/9), son and heir apparent of John, Lord Mautravers (d. 1363/4) [see Complete Peerage, vol.8, p.584-6].
[This error was pointed out independently by Leo van de Pas in March 2002 and by Adrian Channing in July 2002.]