St. Robert Bellarmine played an important role in the counter-reformation of the Catholic Church. He helped clarify Catholic teachings and orthodoxy and wrote two catechisms, including one for children. He opposed censuring Galileo and urged him to more clearly define his view of the universe as a theory to prevent him from contradicting the rather literal view of Scripture held the time (e.g. that the sun rises, runs is course in the sky and sets in the west - impossible if it is stationery as Galileo posited).
Hildegard of Bingen was a healer and mystic, using medicinals and plants to treat many ailments. She composed liturgical music, including hymns which has survived to this day. Her playfulness, piety and visions attracted much attention and generated resentment in some church leadership though she was eventually declared a Doctor of the Church by Pope Benedict XVI.