Question: The Papal conclave was convened to elect a pope following a resignation was first announced on the morning of what date?
Sentence (from "Resignation of Pope Benedict XVI"): Benedict XVI's decision to step down as leader of the Catholic Church made him the first pope to relinquish the office since Gregory XII in 1415 (who did so in order to end the Western Schism), and the first to do so on his own initiative since Celestine V in 1294.
Relevant evidence: No