Source : Webster's Revised Unabridged Dictionary (1913)

Carolus \Car"o*lus\, n.; pl. E. {Caroluses}, L. {Caroli}. [L.,
   Charles.]
   An English gold coin of the value of twenty or twenty-three
   shillings. It was first struck in the reign of Charles I.

         Told down the crowns and Caroluses.      --Macawlay.