Conclave to Begin Next Tuesday, 12 March - Vatican City, 8 March 2013 (VIS) – The eighth General Congregation of the College of Cardinals has decided that the Conclave will begin on Tuesday, 12 March 2013. A “pro eligendo Romano Pontifice” Mass will be celebrated in St. Peter’s Basilica that morning. In the afternoon, the cardinals will enter into the Conclave.