In Assassin's Creed Origins, what is the name of the secret order Bayek initially hunts?

In Assassin's Creed Origins, Bayek initially hunts the Order of the Ancients.

The Order of the Ancients is a secret organization operating across Egypt and neighboring regions during the first century BCE. Its members use animal masks and aliases, and Bayek pursues them after a personal tragedy reveals the scale of the conspiracy.

As the story develops, Bayek and Aya establish the Hidden Ones, an early form of the Assassin Brotherhood. Origins therefore presents the conflict before the familiar Assassin and Templar institutions fully take shape in their later forms.

The Templar Order is the later organization descended from the ancient conspiracy, while the Cult of Kosmos belongs to Assassin's Creed Odyssey. The Hidden Ones are Bayek and Aya's emerging organization, not the group he initially hunts.