What is the name of the Assassin's Creed organization before it becomes the Assassins?

The organization before it becomes known as the Assassins is called the Hidden Ones. Assassin's Creed Origins presents its creation in first-century BCE Egypt by Bayek and Aya.

The Hidden Ones form after Bayek and Aya oppose powerful figures in the Order of Ancients, a secret organization seeking control. Their new group operates covertly and follows principles that later become associated with the Assassin Brotherhood, including defending ordinary people from oppressive power.

Origins uses the term to show that the familiar Assassin organization developed gradually. The game takes place centuries before the medieval setting of the first Assassin's Creed, so the later name and formal traditions are not yet fully established.

The Hidden Ones should not be confused with the Order of Ancients. The two groups are opposing organizations: the Hidden Ones protect freedom through secrecy, while the Order of Ancients seeks control through influential rulers and institutions.