One parent was white, the other was black
His mother was a poor unwed black girl.
Martin grew up in poverty.
When he was eleven, he started doing menial jobs for the Dominican fathers.
Later, they received Martin into the order.
He helped establish an orphanage, a hospital for the poor, and even an animal shelter. He also was devoted to constant prayer and penance.
St. Martin de Porres died on this very day in 1639 and was canonized by Blessed John XXIII in 1962.
(adapted from an earlier post)