All he cared about was conquering people, taking everything they owned, and subjugating them. Isfahan, Iran, surrendered without a fight in view of his massive approaching army in 1387, and he treated them mercifully, until his tax collectors started collecting impossibly high tax revenue, whereupon they were killed in the streets. When Timur heard this, he ordered his army to about-face, march on the city, and kill every single living thing in it, even the rats. Birds were shot out of the sky by his archers. The people, men, women and children were beheaded, to a total of 70,000 in just over two days of slaughter. He then ordered their heads piled up as 28 giant towers in the grassy hills around the city, each tower consisting of about 1,500 heads.
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