Sir David de Malpas

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5378/malpas.... (September 24, 2018; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5299/Bleddyn... (May 6, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: The "Malpas" Family in Cheshire; http://www.ancientwalesstudies.org/id152.html. (Steven Ferry, April 19, 2020.)

David ap Ralph ap Einion, the brother of Beannan, married Constance, daughter of Owain Cyfeiliog of Powys. 

• THE "MALPAS" FAMILY IN CHESHIRE By Darrell Wolcott     
  • Yet another citation [11] has David ap Ralph ap Einion, the brother of Beannan in Chart 2, marrying Constance, daughter of Owain Cyfeiliog of Powys.  This link to a well-known Welsh king confirms the timeline of the Malpas family:
    • [11] Pen. 139(1), 192 and Harl. 1977, 54