Source : Webster's Revised Unabridged Dictionary (1913)

Antecessor \An`te*ces"sor\, n. [L., fr. antecedere, antecessum.
   See {Antecede}, {Ancestor}.]
   1. One who goes before; a predecessor.

            The successor seldom prosecuting his antecessor's
            devices.                              --Sir E.
                                                  Sandys.

   2. An ancestor; a progenitor. [Obs.]