The Conclave of the College of Cardinals starts in earnest this week, when the Master of the Papal Liturgical Celebrations, Monsignor Guido Marini, will solemnly announce extra omnes - or the “outside, all” - and the 115 cardinals will find themselves alone in the Sistine chapel alongside their faith, consciences and beliefs. Dr Harry Hagopian, an Armenian Orthodox Christian and Ekklesia associate who advises the Catholic Church in England and Wales on Middle East and interfaith issues, gives his assessment of what is at stake in the choice that is about to be made.