St Peter Claver (1581 - 1654) was born in Catalonia and studied at the University of Barcelona. He became a Jesuit; and while he was studying philosophy in Mallorca, the door-keeper of the college, Alfonso Rodríguez, saw that his true vocation was to evangelize the New World, and encouraged him to fulfil that vocation. (Rodríguez was later canonized on the same day as Peter Claver himself).
He brought fresh food to the slave-ships as they arrived, instructed the slaves and baptized them in the faith, followed their progress and kept track of them even when they were sent to the mines and plantations, defending them as well as he could from oppressive slave-owners. He organized teams of catechists who spoke the many languages spoken by the slaves. He worked in hospitals also, looking after lepers among others, and in prisons.
Naturally he made himself unpopular by his work: as his superior said, ‘unfortunately for himself he is a Catalan, pig-headed and difficult’. Opposition came from both within the Church and outside it, but there were always exceptions. For instance, while many fashionable ladies refused to enter his city churches because they had been profaned by the presence of the blacks, a few, such as Doña Isabel de Urbina, became his strong and lifelong supporters.
At the end of his life he fell ill with a degenerative disease and for four years he was treated neglectfully and brutally by the servant whose task it was to look after him. He did not complain but accepted his sufferings as a penance for his sins.
See also: Catholic Encyclopedia and Wikipedia