Question: Who is the maternal grandfather of Joanna Of Jülich?
Sentence (from "Maria, Duchess of Guelders"): Marie of Guelders († May 12, 1405) was one of two pretenders to the title of Duchess of Guelders and Countess of Zutphen on behalf of her son during the War of the Guelderian Succession from 1371 to 1379.
Relevant evidence: No