In Assassin's Creed Origins, what ancient organization do Bayek and Aya establish?

In Assassin's Creed Origins, Bayek and Aya establish the Hidden Ones.

The Hidden Ones are formed near the end of the game's story as an organized group dedicated to opposing oppressive rulers and protecting ordinary people. Their creation provides the origin story for the Assassin Brotherhood known in later historical periods.

Origins is set before the Brotherhood is normally called the Assassins. Bayek and Aya therefore do not simply join an existing Assassin order; they help create the movement's early structure, rules, and hidden methods.

The Order of the Ancients is the opposing secret organization in Origins and later becomes connected to the Templar tradition. The Cult of Kosmos belongs to Assassin's Creed Odyssey, so neither name is the answer for Bayek and Aya's organization.