Doge

from WordNet (r) 3.0 (2006)

doge
    n 1: formerly the chief magistrate in the republics of Venice
         and Genoa

from The Collaborative International Dictionary of English v.0.48

Doge \Doge\, n. [It doge, dogio, for duce, duca, fr. L. dux,
   ducis, a leader, commander. See {Duke}.]
   The chief magistrate in the republics of Venice and Genoa.
   [1913 Webster]