probably illegitimate or adopted son:
married to Yolande of Montferrato[?] and had 2 children
See also: Kings of Savoy
... Grant, actor (+ 1986) January 22 - George Balanchine, choreographer (+ 1983) January 26 - Ancel Keys, scientist February 1 - S. J. Perelman[?], humorist, author ...