What does antecessor mean?
The definition of antecessor
An`te*ces”sor, n.
Etym: [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.]