Decades Of Darkness is an Alternate History timeline originating on Alternate History Dot Com. The creator, Jared, got the idea from a contest to create a historically plausible version of S.M. Stirling's The Draka series: a mega evil slaver doom empire, built on opposition to the very values that the Western world holds dear, takes over the world. "DoD", as it's commonly abbreviated, deviated considerably from this origin, which is just as well for that part of the world's population not living under said Empire. You can read the completed story here at the AH.com forum or here or here.