Another name for Joan was Joanne FitzWith.
May have been born in Holt, Worchestershire, England.
Joan married Sir John de Beauchamp Baron Kidderminster, Justice of North Wales, son of Richard Beauchamp and Eustache. (Sir John de Beauchamp Baron Kidderminster, Justice of North Wales was born about 1319 in Holt Manor, Kidderminster, Worcestershire, England, died on 12 May 1388 in London, Middlesex, England and was buried in Worcester Cathedral, Worcester, Worcestershire, England.)
1 Ancestry.com, http://trees.ancestry.com/tree/29106850/family?cfpid=12982912974.