General Notes

Many people have the same Isabel de Ros married to both Marmaduke de Thweng and Walter de Faucomberge.  Certainly Magna Charta Sureties and Ancestral Roots don't mention that the Isabel which married Walter de Faucomberge also married anyone else.  Plus the birth dates of the children of both marriages tend to be intermixed, 1290's and early 1300's, leading one to question which was the first or the second marriage, and indeed whether there were two "Isabel de Ros"s, of two different parents.  According to the Extinct Peerages (see notes under Marmaduke de Thweng), Marmaduke's Isabel was daughter of William of Ingmanthorpe.  Sometimes the Extinct Peerages has proven unreliable, but in this case I believe that it is correct, where Walter's wife Isabel is daughter of Robert de Ros as indicated by MCS & AR.