A. E. Waite
Heydon was accused of plagiarising Sir Thomas Browne, Thomas Vaughan, and other writers; his "Physician's Guide" of 1662 largely derives from Sir Francis Bacon's "New Atlantis." He was referred to as "an ignoramus and a cheate" by Elias Ashmole; Frances Yates termed him a "strange character...an astrologer, geomancer, alchemist, of a most extreme type."; while A. E. Waite considered that all that was of value in his mysticism was derived from anterior writers.