Age of Empires II
Age of Empires II, usually known as Age of Kings, is the second in the Age of Empires series of real-time strategy games by Ensemble Studios, and the sequel to its first release, Age of Empires. Released in 1999, it spans from just after the fall of Rome to the beginning of the Age of Imperialism. Most gameplay takes place in the period commonly known as the Middle Ages. Following the game's success, The Conquerors Expansion was released in 200, adding some new gameplay balancing and five new civilizations.
The AoK map editor is still one of the more popular editors today, with its simple interface yet powerful trigger system. With all of the new trigger tricks, modpacks, and data editing, this very simple little editor can let you do just about anything you want. One of the best places to go to discuss scenario design, get help with projects, or publish completed projects is Age of Kings Heaven.