When St. Dominic of Guzman (1170 - 1221) was a student, he sold his textbooks to buy food for starving people in Spain. He became a priest later and went around telling others about Jesus. He founded the Order of the Preachers, or the Dominicans. Once, when he was praying for the Church, Mother Mary appeared to him and taught him how to say the Rosary. Since then, the Dominicans have encouraged people to pray the Rosary. St. Dominic is the patron saint of astronomers. His feast day is on 8 August.