Catherine de Clifford

No primary source confirms that this Catherine de Clifford was a daughter of Roger de Clifford, 2nd Baron Clifford. Moreover, I° sources do not confirm that Roger, 2nd Baron Clifford ever married or had issue.
Cokayne: http://thepeerage.com/p22807.htm#i228068
Cawley: https://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3.htm#Roger...
Wikitree even detached these relationships, saying, "There is no proof that Roger de Clifford married and he was detached as her husband. It is known that he died without issue." https://www.wikitree.com/wiki/Bower-304

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Children: 1. Thomas WALLER b: 1346