Francis' visit to Cartagena got off to a rocky start, however, when he banged his head on his popemobile when it stopped short amid swarms of well-wishers. Francis, who had only a hip-high bar to hold onto, lost his balance and suffered a black left eye and a cut on his eyebrow that dripped blood onto his white cassock.
The cut was quickly bandaged with a butterfly patch and Francis carried on without incident with his program. Devotees reacted to the injury with a mix of amazement and concern.
"This holy blood is staying in Colombia," said Ricardo Morales, a lawyer who lined up outside St. Peter Claver's church for a glimpse of the pope. "He made a great effort to be here and from now on it's our obligation to make a similar effort to thank him for everything he has done."
Once recovered, Francis visited the St. Peter Claver church, where he praised the 17th century missionary for having recognized the inherent dignity of slaves. Francis, known for his own simple and austere style, said Claver was "austere and charitable to the point of heroism."
Claver, the self-described slave of the slaves forever, has been revered by Jesuits, popes and human rights campaigners for centuries for having insisted on treating slaves as children of God and worthy of love when others considered them mere merchandise to be bought and sold.
In a prayer Sunday in front of Claver's church, Francis said the legacy of the Spanish priest should serve as a model for the Catholic Church today to "promote the dignity of all our brothers and sisters, particularly the poor and the excluded of society, those who are abandoned, immigrants and those who suffer violence and human trafficking."
"Here in Colombia and in the world, millions of people are still being sold as slaves; they either beg for some expressions of humanity, moments of tenderness, or they flee by sea or land because they have lost everything, primarily their dignity and their rights," he said.
Like Claver, the church's first Latin American pope has insisted on ministering to society's most marginalized. He takes special care of the homeless who live around the Vatican, makes regular phone calls to prisoners, brought a dozen Syrian refugees home with him from a Greek refugee camp, and embraces the sick, the maimed and the deformed every chance he gets.
He has also strongly denounced current-day slave trade, calling human trafficking a crime against humanity and getting leaders of other faiths to join him in taking a united stand against it.
Francis prayed at Claver's tomb after laying the foundation for new residences for homeless people in Cartagena, the city famous for its UNESCO-listed colonial center but also home to slums and shanties.
He was to celebrate Mass in Cartagena's port Sunday before returning to Rome, ending a five-day visit highlighted by a huge prayer of reconciliation that brought together victims of Colombia's long-running conflict, along with demobilized guerrillas and paramilitary fighters.
Francis had refrained until Sunday from speaking out about the political and humanitarian crisis in neighboring Venezuela. But in remarks added to his Sunday prayer, Francis called for an end to political violence in Venezuela and protection for the poor, who have been most hurt by the crisis.