In 1271, with the papal throne vacant for over two years, local officials locked the cardinals of the Catholic Church in a room, forcing them to select a new pope. From this inauspicious beginning arose the practice of the conclave, the highly secretive combination of rituals and politics designed to select a new leader for the world's Catholic population. With Pope John Paul II ailing, the time for a new conclave draws nearer, and Rome is preparing...