Question: Who is the paternal grandfather of Ferdinand, Duke Of Viseu?
Sentence (from "João de Lencastre, 1st Duke of Aveiro"): When he was 12 years old, he served crown prince John( who became later King John III of Portugal) and King Manuel I granted him the title of Marquis of Torres Novas by a royal decree issued on March 27, 1520.
Relevant evidence: No