Lineage & Ancestry of HRH Prince Charles, Prince of Wales @ Vol I p 12, Matilda of Perche, d of Rotrou Count of Perche &
Matilda FitzHenry Princess of England
The cited information was published by Skilton, Edinburgh, Scotland, 1977 (Ref: Vol I p 12, Matilda of Perche, d of Rotrou Count of Perche &
Matilda FitzHenry Princess of England) The author/originator was Gerald Paget.