Timur (Tamerlane (Timur the lame, he was a gimp))

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Of note during the Persian campaign was the capture of Isfahan. When Isfahan surrendered to Timur in 1387, he treated it with relative mercy as he normally did with cities that surrendered. However, after the city revolted against Timur's taxes by killing the tax collectors and some of Timur's soldiers. Timur ordered the massacre of the city's citizens with the death toll reckoned at between 100,000 and 200,000.[53] An eye-witness counted more than 28 towers constructed of about 1,500 heads each.[54] This has been described as a "systematic use of terror against towns...a http://en.wikipedia.org/wiki/Timur#Period_of_expansion

If there was a historical terrorist -- it's Timur. That body count in today's population density might be 1 million in a few days?