The Collaborative International Dictionary of English v.0.48:

Cavalero \Cav`a*le"ro\, Cavaliero \Cav`a*lie"ro\
   (k[a^]v`[.a]*l[=e]"ro), n. [Sp. caballero. See Cavalier.]
   A cavalier; a gallant; a libertine. --Shak.
   [1913 Webster]