So, the Chaos Gods sprang into existence sometime in mankind's prehistory, from what I can gather. Since then, they have been elevating their favourite sentient beings to Daemon Prince status. I have a couple of ideas on some of the historical personages they would choose:
Tzeentch: Aleister Crowley (founder of the OTO, the Great Beast 666)
Slaanesh: Gilles de Rais (luxury addict and child killer), the Marquis de Sade (everyone knows this guy!)
Nurgle: Shiro Ishii (biological warfare prodigy), Shoko Asahara (death cult leader)
Khorne: Ivan the Terrible (laid siege to Novgorod, a province in his own country, just for the hell of it)
So, who do think the Chaos gods would have chosen to elevate throughout human history?