Question: When did Amadeo I Of Spain's father die?
Sentence (from "Amadeo I of Spain"): Granted the hereditary title of Duke of Aosta in the year of his birth, he founded the Aosta branch of Italy's royal House of Savoy, which is junior in agnatic descent to the branch descended from King Umberto I that reigned in Italy until 1900, but senior to the branch of the Dukes of Genoa.
Relevant evidence: No