St. Francis Xavier was of noble birth and planned on a career as a professor. Well, he was friends with fellow Spaniard St. Ignatius of Loyola. It wouldn't be a surprise to know that he didn't take that career path, instead St. Francis wound up being a hard core Jesuit missionary, preaching and converting people in the far East, from India to Japan.
He is a patron of missionaries, navigators, China, India, China, and Japan.
Sanctus Franciscus Xaverius, ora pro nobis