Rise of Nations is a real-time strategy video game developed by Big Huge Games and published by Microsoft Game Studios in May 2003. Designed as a fusion of concepts from turn-based strategy games with the real-time strategy genre, the game's development was led by Brian Reynolds, who founded Big Huge Games following his involvement in the development of the turn-based strategy games Civilization II and Sid Meier's Alpha Centauri. In contrast to previous historical real-time strategy games, Rise of Nations is based on the entirety of history, taking place from the ancient era to the modern age, and features eighteen civilizations, playable across eight ages of world history. The game features several innovations on the real-time strategy genre, introducing novel features such as territory and attrition influenced by the turn-based strategy genre.

Big Huge Games, Inc. is an American video game developer based in Timonium, Maryland since 2000, known first for real-time strategy games such as Rise of Nations, later for the console RPG Kingdoms of Amalur: Reckoning, and more recently for mobile games such as DomiNations and Arcane Showdown. Throughout most of its history the company has been associated with its best-known founder, Brian Reynolds, whose prior career already included work as lead designer of Civilization II and Alpha Centauri, and co-founder of Firaxis Games. The studio's ownership has changed hands several times over the years, and it became briefly defunct in May 2012, but it was revived by Reynolds along with several original alumni and new partners. The company is presently owned by Nexon, and actively runs its mobile titles DomiNations and Arcane Showdown, while continuing to develop new games.