Pope Francis arrived at the Palace of the Revolution in Havana on Sunday and met Cuba's President Raul Castro, Fidel Castro's brother. The meeting comes after the pontiff addressed crowds in the Cuban capital, urging political leaders to tread the path of peace and cooperation and to show the warming political climate between the US and Cuba as an example to the world. Pope Francis is credited with assisting the thawing of relations between the USA and Cuba, who have resumed diplomatic ties after over 50 years of cold relations.