Martín de Porres Velázquez OP was a Peruvian lay brother of the Dominican Order who was beatified in 1837 by Pope Gregory XVI and canonized in 1962 by Pope John XXIII. Euphamistically called "slave to the slaves" because he served the most marginalized people, particularly African slaves, with immense love and compassion, treating them with the same dignity he offered everyone else. He is the patron saint of Black people, mixed-race people, barbers, innkeepers, public health workers, all those seeking racial harmony, and animals.
You will find his shrine in Lima, Peru and also a National Shrine in Memphis, Tennesse