The Cult of Kosmos was a secretive organization which operated throughout Greece in the 5th century BCE. The Cult worshipped a deity called Kosmos and plotted to control the Hellenic world from behind the scenes for their own interests.

https://assassinscreed.fandom.com/wiki/Cult_of_Kosmos#:~:text=The%20Cult%20of%20Kosmos%20was,scenes%20for%20their%20own%20interests.