In 1401, a warlord of Mongol descent, Tamerlane (Timur Lenk), invaded Iraq. After the capture of Baghdad, 20,000 of its citizens were massacred. Timur ordered that every soldier should return with at least two severed human heads to show him (many warriors were so scared they killed prisoners captured earlier in the campaign just to ensure they had heads to present to Timur). Timur also conducted massacres of the indigenous Assyrian Christian population, hitherto still the majority population in northern Mesopotamia, and it was during this time that the ancient Assyrian city of Assur was finally abandoned.