Age of Empires
Age of Empires is a series of historical real-time strategy video games, originally developed by Ensemble Studios and published by Microsoft Studios. The first title of the series was "Age of Empires", released in 1997. Seven titles and three spin-offs have been released.
Empire (PLATO)
Empire is the name of a computer game written for the PLATO system in 1973. It is significant for being quite probably the first networked multiplayer arena shooter-style game. It may also be the first networked multiplayer action game (although "Maze War" is another possibility for this distinction).