In the Assassin's Creed video game series, which company developed the original 2007 game?

Ubisoft Montreal developed the original 2007 Assassin's Creed video game.

The game began as a planned Prince of Persia spin-off before evolving into a new intellectual property. Ubisoft Montreal created the project, while Ubisoft published it. The story follows Desmond Miles, who uses the Animus to experience the memories of his ancestor Altaïr Ibn-La'Ahad during the Third Crusade.

Ubisoft Montreal remained a major studio in the franchise, also developing Assassin's Creed II, Assassin's Creed Brotherhood, Assassin's Creed Revelations, Assassin's Creed Origins, and Assassin's Creed Valhalla. Other Ubisoft studios later led different entries, including Ubisoft Quebec on Assassin's Creed Odyssey and Assassin's Creed Syndicate.

A common mix-up is confusing the developer with the publisher: Ubisoft was the publisher and corporate owner, while Ubisoft Montreal was the principal development studio for the first game.