German Cardinal Joseph Ratzinger, Dean of the College of Cardinals, attends a Mass, presided over by Chilean Cardinal Jorge Arturo Medina Estevez, in the Vatican's St. Peter's Basilica April 16, 2005. A conclave of 115 eligible cardinals will congregate on Monday to begin the process of electing a new pope. REUTERS/Kimimasa Mayama CRB/DL