Source : Webster's Revised Unabridged Dictionary (1913)

Captaincy \Cap"tain*cy\, n.; pl. {Captaincies}.
   The rank, post, or commission of a captain. --Washington.

   {Captaincy general}, the office, power, territory, or
      jurisdiction of a captain general; as, the captaincy
      general of La Habana (Cuba and its islands).