Which Assassin's Creed game first used the name Hidden Ones for the precursor to the Brotherhood?

Assassin's Creed Origins first used the name Hidden Ones for the precursor to the Assassin Brotherhood.

The game follows Bayek of Siwa and Aya as they help establish a secret organization in Ptolemaic Egypt. This group is called the Hidden Ones, and its principles, methods, and symbols provide the historical foundation for the later Assassin Brotherhood seen throughout the series.

Origins presents the organization as a response to abuses of power and political manipulation. Bayek and Aya initially pursue members of the Order of the Ancients, a group that serves as an early form of the Templar Order. Their work gradually develops into a structured movement dedicated to protecting people from domination.

The name is important because the game is an origin story rather than simply another chapter in the Brotherhood's established history. Odyssey is set earlier but does not center on the formal creation of the Hidden Ones, while Valhalla and Mirage take place after Origins in the series' historical chronology.