Johannes Trithemius

Johannes Trithemius (February 1, 1462 - December 13, 1516), or Ioannes Tritemius, born Johann Heidenberg, was a German Catholic monk, abbot of the Benedictine Abbey at Sponheim (1483-1506) and later St. James's Abbey at Würzburg (1506-1516), and influential scholar interested in lexicography and cryptography, the latter being a subject in his Steganographia.