Question: Who is Rotrou Iii, Count Of Perche's paternal grandfather?
Sentence (from "Geoffrey II, Count of Perche"): Geoffrey II (died October 1100), Count of Mortagne and Count of Perche, son of Rotrou I, Viscount of Châteaudun, and Adelise de Bellême, daughter of Guérin de Domfront.
Relevant evidence: Yes