Question: Who is Gaston Iv, Count Of Foix's paternal grandfather?
Sentence (from "Gaston IV, Count of Foix"): At the time, Leonor appeared to have few prospects: her father was a younger son and brother of kings of Aragon, and Leonor had a brother, Charles of Viana, and an older sister, Blanca, standing between herself and the throne of Navarre.
Relevant evidence: No