Stoves are seen in the Sistine Chapel at the Vatican March 8, 2013. Roman Catholic cardinals will start their conclave to elect a successor to Pope Benedict on the afternoon of Tuesday March 12, the Vatican said in a statement on Friday. REUTERS/ Osservatore Romano (VATICAN - Tags: RELIGION) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS