Sir William De St. Maur 
William De was born in Woundy & Penhow,Monmouthshire,England.1 He was an only child. William De is no longer alive.General Notes
Fact 1: ABT. 1230 Allied w/ Gilbert Marshall E. of Pembroke vs. Morgan ap Howell. 3
Fact 2: They disposessed Morgan ap Sir Howell ap Iorwerth of Undy. 3
This site is made-up of my own family tree, plus contributions from many others who have shared their research, as well as downloads from from the internet. Not everything has been varified. It should be used with caution, but is a good place to start.
They had a son named Sir William II of Undy and Penhow.
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Children
Sir William II of Undy and Penhow de St. Maur
Sir William II of Undy and Penhow was born in of Penhow,Monmouthshire.1 He died in 1271.1
1 {Pullen010502.FTW}
Further sources/citations:
Ahnentafel for Margery Arundell, Wallop Family & Their Ancestry @ p 702
Further sources/citations:
Ahnentafel for Margery Arundell, Wallop Family & Their Ancestry @ p 702
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