A Biretta is seen during the First Vespers on the occasion of the first week of Advent in Saint Peter's Basilica at the Vatican November 27, 2010. REUTERS/Stefano Rellandini (VATICAN - Tags: RELIGION)

Reinhard Marx, new archbishop of Munich and Freising arrives in the convent of the northern Bavarian village Scheyern January 30, 2008. Marx will celebrate his official inauguration on February 2, 2008, in Munich. REUTERS/Michaela Rehle (GERMANY)

A Swiss Guard adjusts a Biretta during a Consistory ceremony in Saint Peter's Basilica at the Vatican November 25, 2007. Pope Benedict, elevating 23 prelates from around the world to the elite rank of cardinal, made a pressing appeal on Saturday for an end to the war in Iraq and decried the plight of the country's Christian minority. REUTERS/Alessandro Bianchi (VATICAN)