Burke's Genealogical & Heraldic Guide to the Peerage, @ 1938 ed, p 1808, d of Roger de Cauz, no mother
The cited information was published by Burke's Peerage, London, 1949 (Ref: 1938 ed, p 1808, d of Roger de Cauz, no mother) The author/originator was Burke's Peerage.
Source Notes
TITL Burke's Genealogical & Heraldic Guide to the Peerage, Baronetage & KnightageABBR Burke's Peerage