The siege of Merv (Persian: محاصره مرو) took place in April 1221, during the Mongol invasion of Khorasan. In 1219, Genghis Khan, ruler of the Mongol Empire, invaded the Khwarazmian Empire ruled by Shah Muhammad II. While the Shah planned to defend his major cities individually and divided his army to station in several garrisons, the Mongols laid siege to one town after another deep into Khorasan, heart of the Khwarazmian Empire.
The city of Merv was a major center of learning, trade and culture of Khorasan, then part of the extensive Khwarazmian Empire. A Mongol force, estimated to number between 30,000 and 50,000 men and led by Tolui, son of Genghis Khan, traversed the Karakum Desert after destroying the former imperial capital Gurganj in the north. According to several contemporary historians, Merv's defenders surrendered to Mongols within 7 to 10 days.
Historical accounts contend that Merv's entire population, including refugees, who had previously fled from other besieged towns of the empire, were killed. Mongols are reputed to have slaughtered 700,000 people, while Persian historian, Juvayni, as well as R. J.
HistoryLayer draws the world as it was in any year from 123,000 BCE to
2026. Move the slider and the borders redraw for that year; the map
carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each
one readable in place. Signing in is optional and lets you keep what
you find.