Who exactly was Hugh de Vernon?

Here is some background information on the Vernon family, maybe it will help:
http://www.tonybostock.com/shipbrook.pdf

Here's another source:
http://books.google.com/books?id=5S0BAAAAQAAJ&pg=PT147&lpg=...

Thanks for these sources. Most useful.

Pam Wilson (on hiatus) you may be interested in these sources as they link to profiles you curate.

Thanks, Terry and Pamela.

Following on (only 5 years later!) - is there any actual source for Hugh's wife being Margaret de Knightley? The links in the above thread - the tony bostock document is no longer on his site, and the Heraldic Illustrations Pedigree does not specify wife's name. There is no apparent source reference on the internet. On the other hand, there are references to his wife being (possibly) Mathea de Baillot, eg Ormerod Chester Vol 3. If anyone has a reference to the Vernon/Knightley marriage I'd be interested to know!