A new Pope
Crowds of up to 200,000 gathered under bright sunshine in St. Peter's Square to witness Pope Francis' inaugural Mass, formally marking the start of his reign as head of the world's 1.2 billion Catholics.
Francis set the tone for a new, humbler papacy with a ceremony that was less flashy than his predecessor's, and he underlined his central message that the Church's mission was to defend the poor and disadvantaged.
A nun runs in Saint Peter's Square to get a good spot before the Mass begins.
The flags of Germany and Argentina are held aloft during the service, honouring the nationalities of new Pope Francis and former Pope Benedict.
Pope Francis waves as he arrives in Saint Peter's Square.
He leans down from his car to kiss a child on the forehead.
Pope Francis, formerly Buenos Aires Cardinal Jorge Bergoglio, walks by an Argentine flag as he arrives in Saint Peter's Square.
He passes a group of waving priests. Many in the crowd said they had high hopes of a more humble papacy under Francis, who as a Jesuit has taken a vow of poverty and who said he would be inspired by the lowly.
Members of the crowd hold up a banner of the pope as he arrives in Saint Peter's Square.
A man and woman kneel down on the street to pray.
Pope Francis arrives in Saint Peter's Square in his open white jeep.
He passes lines of cardinals and dignitaries as he approaches the altar.
The 76-year-old is helped as he descends the stairs.
He kisses the altar during the Mass.
The Fisherman's Ring is placed on his finger.
He showed his humble style by wearing simple white vestments, black lace-up shoes and a low modern mitre, or bishop's hat. The vestments of the cardinals attending the Mass were more decorated than his.
Germany's Chancellor Angela Merkel (left), the Netherland's Prince Willem-Alexander and Princess Maxima (centre), and Spain's Prince Felipe and Princess Letizia (right) were among world leaders, royals and dignitaries attending the mass.
Princess Maxima (left) of the Netherlands leans over to shake the hand of Spain's Princess Letizia.
Zimbabwe's President Robert Mugabe (second right) and his wife Grace sit across the aisle from European Council President Herman Van Rompuy (left) and his wife Geertrui Windels. Mugabe, who has been under a European Union travel ban since 2002, was able to travel to the Vatican because it is a separate territory, outside the EU.
Members of the clergy are seen below a statue of Saint Peter during the service.
Crowds fill Saint Peter's Square.
Thousands of faithful in central Buenos Aires wait before dawn in front of large television screens to watch the inaugural celebrations. Before the Mass began, the Argentine pope made a surprise phone call to his compatriots, thanking the crowd for their prayers "which I need a lot".
The crowds near Buenos Aires Metropolitan Cathedral watch the inaugural mass after the Pope told them: "I want to ask you a favour, that we walk together, that we look after each other... Don't forget this bishop, who though far away, cares so much for you."
