The Papal conclave was convened to elect a pope following a resignation was first announced on the morning of what date?
Papal conclave, 2013: The Papal conclave of 2013 was convened to elect a pope to succeed Pope Benedict XVI following his resignation on 28 February 2013. Resignation of Pope Benedict XVI: The resignation of Pope Benedict XVI occurred on 28 February 2013 at 20:00 (8:00 PM) CET (19:00 UTC). Resignation of Pope Benedict XVI:  The resignation was first announced on the morning of 11 February 2013 by the Vatican.
11 February 2013