1 in every 200 men is a descendant of Genghis Khan.

Geneticists have found that nearly 8% of men that live in what was once the Mongol Empire (a rather large chunk of Asia) in the 13th century all carry identical y-chromosomes. All 16 million of these men (roughly half of a percent of all men in the world) are direct descendants of the Mongol leader, Genghis Khan.

This can be seen as a sort of circumvention of the process of natural selection. The cultural significance of having children who can claim ancestry to Genghis Khan led to his male descendants being unusually prolific for the century’s after his rule. This is notable for being a rare instance in which a single genetic lineage becomes widespread in a relatively short time.
(source)