Question: Who is Isabella Of Bourbon's maternal grandfather?
Sentence (from "Agnes of Burgundy, Duchess of Bourbon"): Agnes of Burgundy (1407 – 1 December 1476), duchess of Bourbon (Bourbonnais) and Auvergne, countess of Clermont, was the daughter of John the Fearless (1371–1419) and Margaret of Bavaria.
Relevant evidence: Yes