President Barack Obama has lost no time extending olivebranches to the world and promising to mend diplomatic fences that his predecessor heedlessly trampled on.
Thousands of pilgrims wave palms and olivebranches, symbols of peace, to be blessed by the pope as he leads a procession around the square before delivering mass outside.
Peter's Square, encouraging people to be humble and young at heart as he promised to go to a youth jamboree Brazil this summer, while the faithful enthusiastically waved olivebranches and braided palm fronds.