Hildegard of Bingen was from Germany. She's mostly known for her religious visions and prophecies. She lived in the XI and XII century, but even so, her message is still quite alive. The Pope has talked about her and her message in two general audiences.
Also, in coming months, the Pope is considering declaring her a Doctor of the Church for her high intelligence and feminine sensibility.
St. Hildegard was one of the most active women of her time. She wrote about theology and morals, but also about medicine and science. She even found the time to compose 78 musical pieces.