Which Assassin's Creed game first introduced the modern Animus character Layla Hassan?

Assassin's Creed Origins first introduced the modern Animus character Layla Hassan.

Layla is a researcher who uses an upgraded Animus to explore the memories of Bayek of Siwa and Aya in Ptolemaic Egypt. Her modern-day storyline forms the framework around the historical campaign and continues into later games, including Odyssey and Valhalla.

Assassin's Creed Origins was released in 2017 and depicts events in the first century BCE. Its story follows Bayek, a Medjay, and Aya as they become involved in the origins of the Hidden Ones, the organization that later develops into the Assassin Brotherhood.

A common mix-up is treating Layla as the modern protagonist of Odyssey, because she also appears there. Origins is the game that introduced her. It also changed the series toward a more extensive role-playing structure, with character levels, equipment statistics, and a large Egyptian open world.