Which Ubisoft studio was the primary developer of the first Assassin's Creed game?

Ubisoft Montreal was the primary developer of the first Assassin's Creed game.

The Montreal studio led production of the 2007 title, building the open-world systems, historical environments, climbing mechanics, combat, and stealth structure that defined the new franchise. Ubisoft Montreal had already developed Prince of Persia: The Sands of Time and related technology, which helped shape Assassin's Creed's movement and exploration.

The project began as a spin-off concept connected to Prince of Persia, but it evolved into a separate property centered on the Assassin Brotherhood and Templar Order. The team combined real historical settings with fictional characters and a modern-day science-fiction story involving the Animus.

Other Ubisoft studios later led major entries. Ubisoft Quebec developed Assassin's Creed Odyssey and Assassin's Creed Syndicate, while Ubisoft Sofia worked on Assassin's Creed III: Liberation. Those later contributions do not change Montreal's primary developer credit for the original game.