John Dee (1527-1608/09) stood at the crossroads of Renaissance science and occultism. Trained at Cambridge in mathematics and astronomy, he became court astronomer to Elizabeth I, advising on everything from her coronation date to England's naval expansion. Dee coined the term "British Empire" and provided navigational expertise for England's voyages of discovery. Yet this same scholar—who owned England's largest private library—devoted his later years to conversing with angels through crystal s