The New York Times recently published an article in 2014 that had a fascinating description of the Kalash, an ancient ethnic group living high in the remote mountains of Pakistan's Hindu Kush. For centuries this light-skinned, pagan people have claimed to be the long-lost descendants of Alexander the Great's world-conquering armies, which invaded this region in the fourth century B.C. The animist Kalash are outwardly different from the darker-skinned Pakistani Muslims who live in the lowlands below them, so it seemed plausible. However, there had been no proof of this remarkable claim until the geneticists quoted in The New York Times found that the Kalash people's DNA seems to indicate that they had an infusion of European blood during a "mixing event" at roughly the time of Alexander's conquests. This isolated people are thus most likely the direct descendants of the ancient Greek-Macedonian armies who set up outposts in this region 2,300 years ago. http://www.nytimes.com/2014/02/14/science/tracing-ancestry-team-produces-genetic-atlas-of-human-mixing-events.html?_r=1