[EUROPEAN SOVEREIGNS AND OTHERS]. ALEXANDER I, Emperor of Russia (1777-1825). Autograph letter signed ("Alexandre") as Emperor, Paris, 15 September 1815. 1 pages, 4to, with envelope addressed to "Le Duc de Glouchester." A fine letter, in French, to his cousin. -- FRANCIS I, King of France (1494-1547). Manuscript document signed ("Francoys'), [1527]. 1 page, folio, ON PARCHMENT, in French. Official instructions. -- FREDERICK II ("The Great"), King of Prussia. Letter signed ("Frck"), to an army officer in Granges, Guhlau, 28 August 1784. 1 page, 4to, in German. Military instructions regarding the 5th Corps and Jgers. -- MAZZINI, GIUSEPPE, Italian patriot and revolutionary. Autograph letter signed ("G. Mazzini") to Mrs. [Leigh?] Hunt, n.d. 4 pages, 12mo. Interesting comments on the state of affairs in Italy, and the Risorgimento movement. -- DE WITT, JOHAN, Dutch statesman, naval officer. Autograph letter signed ("Johan de Witt"), 12 July 1656. 1 page, folio, in Dutch. Fine. -- DE WITT, CORNELIUS, Dutch statesman. Document signed ("C. De Witt"), n.d. 1 page, folio, on parchment, in Dutch. -- JOHN II OF ARAGON, King of Spain and father of Isabella (1404-1454). Document signed, Villa de Madrigal, 2 February 1432. 1 page, 310 x 300 mm. (12 x 11 in.), written in a typical Spanish clerical hand, partial red wax seal preserved on verso, browning -- And five others, including: E. Renan (ALS), Theodor Mommsen (ALS), C. de Soubise (DS), Louis Philippe D'Orleans (LS, with clipped address panel, seal intact), and another, unidentified. Together eleven items. (11)