Question: When is Constance Of Aragon, Queen Of Sicily's father's birthday?
Sentence (from "Peter IV of Aragon"): His reign was occupied with attempts to strengthen the crown against the Union of Aragon and other such devices of the nobility, with their near constant revolts, and with foreign wars, in Sardinia, Sicily, the Mezzogiorno, Greece, and the Balearics.
Relevant evidence: No