Wallop Family & Their Ancestry, Film: LDS Film#1696491 items @ p 190, Joan (de Valletort)
The cited information was published by Oxford: John Johnson, Oxford, 1928 (Ref: p 190, Joan (de Valletort)) The author/originator was Vernon James Watney.
Source Notes
A four volume work that was published not long after the turn
of the century. It is available on microfilm from the LDS
Church.