Assassin's Creed began as a planned sequel to which video-game series?

Assassin's Creed began as a planned sequel to the Prince of Persia video-game series.

During development at Ubisoft Montreal, the project was conceived as a spin-off or sequel connected to Prince of Persia: The Sands of Time. The idea centered on an apprentice protecting a prince, but the concept gradually expanded into a larger game about secret societies, historical freedom fighters, and assassinations.

As development continued, the project became a new intellectual property rather than a Prince of Persia title. The result retained some design DNA associated with that series, especially acrobatic movement and traversal across densely built environments.

The first Assassin's Creed ultimately launched in 2007 and introduced Altaïr Ibn-La'Ahad and Desmond Miles. Splinter Cell and Far Cry were also Ubisoft franchises, but neither was the direct source of Assassin's Creed's original development concept.