|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 11, page 502 (as modified by volume 14):
He [Robert (de Scales), Lord Scales (d. 1369)] m., before 6 May 1335, Catherine, sister and coh. of William, 2nd EARL OF SUFFOLK, da. of Robert (DE UFFORD), 1st EARL OF SUFFOLK, by Margaret. sister of Sir John DE NORWICH, [and] da. of Walter DE NORWICH [1st LORD NORWICH] to whose grandson, John [2nd LORD NORWICH], her issue ultimately became heirs.
The modified reading introduced in volume 14 is misleading - it was Margaret's brother Sir John who was 1st Lord Norwich, and Sir John's grandson John who was 2nd Lord [Complete Peerage, vol. 9, p. 764].
[This inconsistency was pointed out by Dave Utzinger in December 2001, and discussed by Tim Powys-Lybbe.]