Question: Who is César, Duke Of Vendôme's paternal grandmother?
Sentence (from "César, Duke of Vendôme"): César de Bourbon, "Légitimé de France" (3 June 1594 – 22 October 1665) was the illegitimate son of Henry IV of France and his mistress Gabrielle d'Estrées, and founder of the House of Bourbon-Vendome.
Relevant evidence: Yes