From the Celtic Casimir online family tree:

http://www.celtic-casimir.com/webtree/17/31456.htm

Joan DE BRUS [593],[2793],[8306]

• Born: Abt 1226, Skelton Castle, Yorkshire, England
• Married: 27 Sep 1237, 1st wife - contract date [2793],[8305]
• Died: Before 13 Oct 1243 [8306]

General Notes:

He [Piers de Mauley] married, 1stly, Joan, eldest daughter of Piers DE BRUS.

• She apparently died before 13 October 1243.
• The name of his 2nd wife is not known.
• He died before 15 July 1279.
• [Complete Peerage VIII:558-9, (transcribed by Dave Utzinger)] [593],[2793]

Marriage Information:

• Joan married Piers II DE MAULEY Sheriff of Northamptonshire on 27 Sep 1237 in 1st wife - contract date [2793],[8305].
• (Piers II DE MAULEY Sheriff of Northamptonshire was born before 1226 in Mulgrave Castle, Sandsend/Whitby, Yorkshire, England [8146] and died before 15 Jul 1279 in Nether Hallam Manor, West Riding Yorkshire, England [8146].)

References:

593. Jim Weber <jim.weber at nwintl.com>, WorldConnect at Rootsweb:

• http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jweber&id=I11952
• (Outdated link, should be: http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jweber&id=I04786 )

2793. Jim Weber <jim.weber at nwintl.com>, WorldConnect at Rootsweb:

• http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jweber&id=I23039
• (Outdated link)

8146. Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Ltd, 2000, VIII:558-9

8305. Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Ltd, 2000, VIII:558

8306. Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, by G. E Cokayne, Sutton Publishing Ltd, 2000, VIII:559