Board Thread:Assassin's Creed general discussion/@comment-26314858-20150714112803/@comment-2112031-20171128163854

SupremeAssassin wrote: I don't consider Adam and Eve, much less Cain and Abel to be proto-Assassins and Templars. They may have had the ideas, but they didn't have the practice or the organization. Who would be a proto-Assassin? Darius, who assassinated Xerxes with the first Hidden Blade. He's a proto-Assassin, and Bayek was the first, official Assassin.

In general, we consider proto-Assassins and proto-Templars to have been groups who believed in and fought for the same or at least similar beliefs and goals as their later successors.

Adam and Eve were both identified as being among the first Assassins in Into the Animus, which, combined with what we now know because of Origins, is why they are considered proto-Assassins.

Darius didn't share the same practice and organization as the Assassins either, aside from being the first recorded user of the Hidden Blade. He is considered by later Assassins to have been one of them because he, and whatever group he might have belonged to, fought for the same ideals and goals.