Carl Otto Reventlow (actually Karl Carl Christian Otto; born 1817 in Store Heddinge (Denmark), died in 1873) became notable as the developer of a mnemonic system.
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There is, despite a personal acquaintance to some members to the Reventlow family of old Holstein-Mecklenburg nobility through his studies at university of Kiel, no family relation.
Otto von Bismarck | Carl Sagan | Carl Jung | Carl Orff | Carl Maria von Weber | Carl Lewis | Carl Zeiss AG | Carl Linnaeus | Carl Sandburg | Carl XVI Gustaf of Sweden | Carl Levin | Otto | Carl Zeiss | Carl Michael Bellman | Carl Friedrich Gauss | Carl Froch | Otto III | Otto Piene | Otto I, Holy Roman Emperor | Otto I | Carl Perkins | Carl von Clausewitz | Carl Reiner | Otto Preminger | Carl Hancock Rux | Carl Gustaf Emil Mannerheim | Carl Edwards | Carl Cox | Carl Bildt | Carl Barks |