The Collaborative International Dictionary of English v.0.48:

Mantinea \Mantinea\, Mantineia \Mantineia\prop. n.
   The site of three famous battles among Greek city-states: in
   418 BC and 362 BC and 207 BC.

   Syn: Mantineia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mantineia
    n 1: the site of three famous battles among Greek city-states:
         in 418 BC and 362 BC and 207 BC [syn: Mantinea,
         Mantineia]