Which game introduced Bayek of Siwa as its main protagonist?

Assassin's Creed Origins introduced Bayek of Siwa as its main protagonist.

Released in 2017, Origins follows Bayek, a Medjay from the Siwa Oasis, and his wife Aya during the final decades of Ptolemaic Egypt. Their personal quest develops into the origin story of the Hidden Ones, the organization that later becomes the Assassin Brotherhood.

The game marked a major change in the series by adding role-playing systems, loot, character levels, and a larger emphasis on open-world exploration. Its setting includes Alexandria, Memphis, Cyrene, and the Giza plateau. Bayek is not the protagonist of Odyssey or Valhalla: those games focus on separate characters and later historical periods.