Which Assassin's Creed game introduced Basim Ibn Ishaq?

Assassin's Creed Valhalla introduced Basim Ibn Ishaq.

Basim is a prominent character in Valhalla, first appearing as a Hidden One operating in ninth-century Baghdad before traveling to England. He becomes connected to Eivor during the Viking settlement story and plays a central role in the game's modern and historical mysteries.

The character's importance extends beyond his initial supporting role. Valhalla reveals major details about Basim's identity and past, making him one of the series' most consequential recurring figures. He later became the central playable character in Assassin's Creed Mirage, which explores his earlier life in Baghdad.

This can cause confusion because Mirage is Basim's first starring game, but it did not introduce him to the franchise. Valhalla was released first, in 2020, while Mirage followed in 2023 as a prequel-style story focused on his development as an Assassin.