How many people did Tamerlane kill?

Answer 1

Anywhere from 10 to 20 million people

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Nobody knows, because nobody was counting. Medieval chroniclers loved to throw out high (and vaguely-rounded) numbers to underline their point (people still do it today. "Killed millions" generally means "was a ruthless conqueror" and little more. Much loss of life in successive Asian conquests was probably occasioned by disruption of local livelihoods or reversion of farmland to pasture rather than mass butchery (why slaughter your new taxable subjects?). The answer is pobably far less than the conventional figures. A population drop in the millions (if such was the case) doesn't necessarily mean that millions were killed, more likely that economic life was fractured for a time and much of the land returned to less intensive use capable of supporting fewer people.