What was the name of the first Assassin Brotherhood founded in Assassin's Creed Origins?

The first Assassin Brotherhood founded in Assassin's Creed Origins was called the Hidden Ones. Bayek and Aya establish the organization after uncovering a conspiracy by the Order of the Ancients in Ptolemaic Egypt.

The Hidden Ones operate secretly and adopt principles that shape the later Assassin Brotherhood. Their work centers on resisting oppressive rulers and protecting ordinary people, while remaining concealed from the societies they influence. Their earliest base is connected to the Egyptian setting of the game.

The Order of the Ancients is the opposing organization in Origins and is the historical predecessor of the Templar Order, so the two names are easy to confuse. The later title “Assassins” is not the organization's original name in this period. Origins uses the Hidden Ones to show how the series' central faction developed over time.