<p>Best known today as a fine composer, the twelfth-century German abbess Hildegard of Bingen was also a religious leader and visionary, a poet, naturalist and writer of medical treatises. Despite her cloistered life she had strong, often controversial views on sex, love and marriage too - a woman astonishing in her own age, whose book of apocalyptic visions, Scivias, would alone have been enough to ensure her lasting fame.<br><br><br>In this cla...