Recently republished in paperback, Timothy May’s “The Mongol Empire” is part of a major series of books on the history of the Islamic world from the University of Edinburgh.

May provides a much-needed global perspective on Mongol rule, and its impact on Islam itself: Mongol converts represented a staggering increase in the number of Muslims in the world at the time, and their conquest only fueled the spread of the religion. Three further Islamic empires, meanwhile, would rise from the Mongol’s eventual disintegration.

But unlike the Ottoman, Fatimid and Seljuk empires, the Mongols were not majority Muslim; indeed, one of the great strengths of the four great “Khanates” was the tolerance of religious freedom they extended to their subjects.

The greatest Khan, Temujin, was crowned Genghis Khan, Ruler of the Universe, in 1206. In his late thirties, he was a brilliant warrior and commanded a vast army famed and feared for its superb horsemanship and remarkable archery. Cunning and opportunistic, he allegedly proclaimed: “I am the punishment of God. If you had not committed great sins, God would not have sent a punishment like me upon you.”

When he died in 1227, Genghis Khan ruled an empire the size of a continent, from China to Europe. History shows that it is easier to build an empire than preserve it, and the fate of his successors proved even the Mongol Khans were no exception.

The Mongols left virtually no written record of their empire, but their legacy lasts to this day. During their rule, they not only facilitated trade, offering merchants protection, status, and tax-exemption, but actively encouraged the use of the East-West trade routes later known as the fabled Silk Road, linking China, India, Europe and the Middle East.