German historian and writer, 1821-1891, author of Geschichte der Stadt Rom im Mittelalter, Lucrezia Borgia and other works.
Fishburn and Hughes: "A German historian of Italy, the author of Roman Journals and books about the Papacy and Lucretia Borgia. Gregorovius lived for a time in Ferrara, one of the most important centres of the Papacy. His alleged observation 'that mention of the Phoenix in oral speech was very rare' is probably apocryphal." (82)