Herwart von Hohenburg
Herwart served as chancellor to the Duke of Bavaria, and was regarded by the Bavarian aristocracy as an effective intermediary during the turbulent transition from the reign of Duke Wilhelm V to that of his successor, Maximilian I.
Herwart's fields as a scholar were astronomy, chronology, mathematics and philology. His work in chronology was admired by Michael Mästlin, among others, and his work in mathematics contributed to the early formulation of logarithms by Joost Bürgi and John Napier. He was also associated with Tycho Brahe, Johannes Praetorius, and Helisaeus Roeslin.
Herwart often lent Kepler books that might otherwise have been unavailable to him, and used his influence to help Kepler retain academic appointments despite his Protestantism, as Herwart himself was "an ardent Catholic and a friend of the Jesuits." His extant correspondence with Kepler covers a period from 1597 to 1611 and includes more than 90 letters. The correspondence was discovered by C. Anschütz at Munich, and was first published in 1886. A sample exchange, on an astronomical passage from the Neronian poet Lucan, is available online in English translation.
- Caspar, Max. Kepler. Translated and edited by C. Doris Hellman. New York: Dover, 1993. References to Herwart passim. Limited preview online.
- J. L. E. Dreyer, Tycho Brahe: A Picture of Scientific Life and Work in the Sixteenth Century (Edinburgh 1890), p. 292 online.
- Patrick Boner, "A Scholar and a Statesman: Hans Georg Herwart von Hohenburg as a Critic and Patron of Johannes Kepler," paper presented at the 2007 annual meeting of the History of Science Society, abstract online.
- The Galileo Project, "Kepler, Johannes."
- Max Caspar, Kepler, translated and edited by C. Doris Hellman (New York: Dover, 1993), pp. 80, 83, et passim.
- Patrick Boner, "Scholar and a Statesman."
- Herwart's Catalogus Graecorum manuscriptorum codicum qui asservantur in inclyta serenissimi utriusque Bavariae Ducis ... Bibliotheca (1602), a catalogue of Greek manuscripts and codices in the library of the Duke of Bavaria, digital facsimile
- "Who the Heck is Herwart von Hohenburg?", on Hohenburg's 1610 Thesaurus Hieroglyphicorum, Seattle P.I. blog