In "Assassin's Creed 1", Artell's tutor explicitly mentioned that Artell violated all the creeds when Marcyaf executed Artell: 1. Don't kill innocent people. 2. Don't hurt your classmates. 3. Obey orders and keep a low profile.

Ezio clearly mentioned in Assassin's Creed 2: Brotherhood and Revelation: We live in the shadow and serve the light. We are assassins. The attention is true. Everything is allowed. We are assassins in the dark. Everything is empty, everything is allowed)

Assassin's Creed 3 didn't mention it. . But Connor's creed is freedom.