"Service is never ideological, for we do not serve ideas, we serve people"

The Pontiff, Pope Francis meant with the ex president of Cuba, Fidel Castro, after celebrating Mass in front of tens of thousands of people in Havana.

According to BBC News, The Pontiff and the former president discussed world affairs and religion in an informal and friendly manner in the former Cuban leader's home.

They exchanged books: Pope Francis gave Mr Castro three titles, including a book of sermons by Mr Castro's former teacher, while in return the Pope received Fidel and Religion, a collection of interviews with a Brazilian priest.

Read: Pontiff heads to cuba ahead of US visit

Earlier in the day, thousands streamed into Havana's Revolution Square to hear the Pope.

Security services were seen arresting at least three people who were shouting and attempting to distribute flyers at the edge of the square as the Mass got under way.

Read: 5 epic selfies of Pope Francis

During his homily the Pope spoke of how "Christians are constantly called to set aside their own wishes and desires, their pursuit of power, and to look instead to those who are most vulnerable".

He also warned against ideology, saying: "Service is never ideological, for we do not serve ideas, we serve people".