Sir William de Baguley, Knight - Calendar of the Close Rolls 1302-1307

Almost anything you need is available on the internet here, including the Calendar of Closed Rolls and a number of other of the Kings documents like the Inquisition Post Mortum, Pipe Rolls, Chancery rolls and many others. Also the complete peerage by Cockayne, Burke, etc. LDS has many of these also as microfilm images which I believe can be searchable.

Medieval source material on the internet:
http://www.medievalgenealogy.org.uk/sources/olmed.shtml