The Assassin organization founded in ancient Egypt in Assassin's Creed Origins is called the Hidden Ones.
Bayek and Aya establish the Hidden Ones after confronting the Order of the Ancients, a secretive group seeking political influence through powerful leaders. Their new organization adopts principles of secrecy, resistance to oppression, and protection of ordinary people. These ideas form the fictional institutional foundation for the Assassin Brotherhood seen in later historical periods.
Origins is set in Ptolemaic Egypt, primarily during the first century BCE. The game therefore depicts the Hidden Ones centuries before Altaïr's medieval Brotherhood and long before the Renaissance Assassins led by figures such as Ezio. Their emblematic hidden blade and covert methods become recurring elements of the later organization. The Order of the Ancients is not the Assassin group: it is an earlier form of the opposing Templar tradition. The Raven Clan, meanwhile, is Eivor's Viking community in Assassin's Creed Valhalla.