Bayek of Siwa becomes a founding figure of the Hidden Ones in Assassin's Creed Origins.
Bayek is a Medjay from Siwa, a protector and lawkeeper in Ptolemaic Egypt. After a personal tragedy, he and Aya investigate a secret organization called the Order of the Ancients. Their actions eventually lead to the creation of the Hidden Ones, the precursor to the Assassin Brotherhood.
Origins is set mainly in the first century BCE, during the reign of Cleopatra VII and the political struggle involving Julius Caesar and Ptolemy XIII. The game presents Egypt as a large open world containing Alexandria, Memphis, Siwa, and other regions.
Bayek is sometimes confused with Aya, who is his wife and an important co-founder of the Hidden Ones. He is also not a member of the later, formally named Assassin Brotherhood during most of the game. Origins therefore shows the organization at its beginning rather than at the height of its medieval form.