Hildegard of Bingen (1098-1179) was a mystic who lived during the Middle Ages, when Christian mysticism was just beginning to mature. Her works, which explored themes such as God, humanity, and the universe, as well as her thoughts on various disciplines such as music, botany, and anatomy, have influenced us to this day. A film was made about her, and the monasteries where she lived became virtually a pilgrimage center. She composed nearly a hundred compositions based on the principle of "moving from harmony of notes to unity in God," and her symphonies were used as church music. Like Paul, Hildegard claimed to have had visions and received messages from God. Influenced by these visions, she was considered a counselor or a prophet who foretold the future. Hildegard was a mystic consulted by bishops, Pope Eugene III (1080-1153), and Holy Roman Emperor Frederick Barbarossa (1122-1190). He also traveled to different cities to preach to the people and priests, and in these sermons he criticized the priesthood on some issues and warned people against heretical movements such as the Cathars.