John Dee was a noted mathematician, astronomer, astrologer, occultist, navigator, imperialist, and consultant to Queen Elizabeth I. He devoted much of his life to the study of alchemy, divination, and Hermetic philosophy.Dee straddled the worlds of science and magic just as they were becoming distinguishable. One of the most learned men of his age, he had been invited to lecture on advanced algebra at the University of PAris while still ins his early twenties. Dee was an ardent promoter of mathematics and a respected astronomer, as well as a leading expert in navigation, having trained many of those who would conduct England's voyages of discovery. In one of several tracts which Dee wrote in the 1580s encouraging British exploratory expeditions in search of the Northwest Passage, he appears to have coined the term "British Empire."Simultaneously with these efforts, Dee immersed himself in the worlds of magic, astrology, and Hermetic philosophy. He devoted much time and effort in the last thirty years or so of his life to attempting to commune with angels in order to learn the universal language of creation and brings about the pre-apocalyptic unity of mankind. A student of the Renaissance Neo-Platonism of Marsilio Ficino, Dee did not draw distinctions between his mathematical research and his investigations into Hermetic magic, angel summoning and divination. Instead he considered all of his activities to constitute different facets of the same quest" the search for a transcendent understanding of the divine forms which underlie the visible world, which Dee called "pure verities".Dee's high status as a scholar also allowed him to play a role in Elizabethan politics. He served as an occasional advisor and tutor to Elizabeth I and nurtured relationships with her ministers Francis Walsingham and William Cecil. Dee also tutored and enjoyed patronage relationships with Sir Philip Sidney, his uncle Robert Dudley, 1st Earl of Leicester, and Edward Dyer. He also enjoyed patronage from Sir Christopher Hatton.In his lifetime, Dee amassed the largest library in England and one of the largest in Europe.