He eventually returned to Germany, where he died in Munich.
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He also wrote biographies of Pope Alexander VI and Lucrezia Borgia, as well as works on Byzantine history and medieval Athens, and translated Italian authors into German, among them Giovanni Melis.
Ferdinand Marcos | Ferdinand Magellan | Franz Ferdinand | Ferdinand II of Aragon | Franz Ferdinand (band) | Archduke Franz Ferdinand of Austria | Ferdinand von Mueller | Ferdinand I, Holy Roman Emperor | Ferdinand I | Ferdinand | Louis-Ferdinand Céline | Ferdinand Foch | Rio Ferdinand | Ferdinand VII of Spain | Ferdinand de Lesseps | Ferdinand Porsche | Ferdinand II, Holy Roman Emperor | Ferdinand II | Ferdinand Hodler | Ferdinand I of Naples | Ferdinand III | Ferdinand Vandeveer Hayden | Ferdinand I of the Two Sicilies | Ferdinand I of Bulgaria | Ferdinand I of Aragon | Ferdinand III of Castile | Ferdinand III, Holy Roman Emperor | Ferdinand Finne | Ferdinand Bonaventura, 7th Prince Kinsky of Wchinitz and Tettau | Ferdinand von Zeppelin |