By 1200 AD, the Mongol and Turkic people of Central Asia had pretty much finished pushing the Indo-Europeans out of power in Central Asia and West Asia, and had taken over ruling the whole area. About 1180 AD the Mongols elected a new king, Genghis Khan (Khan means king), who was very ambitious and energetic. Genghis Khan soon formed alliances with the Turkic groups near him, so that he ruled both the Mongols and the Turks. He then had to fight against other Mongols who wanted to rule, but by 1206 AD Genghis Khan had gotten control of all of them. He then, like earlier Persian and Chinese rulers, reorganized the Mongol army to be more professional, and issued a new law code, announcing his intentions to rule as the emperor of a civilized state, not the leader of clans and families as before. Then Genghis Khan led his army against other states. Again like Cyrus, Genghis Khan used new battle methods: his soldiers were better organized and trained than those of his enemies, and they used more advanced equipment, including gunpowder. By 1209, Genghis Khan controlled the Uighurs, the Kyrgyz, the Khitan, and all the other small kingdoms of Central Asia.
Ghengis Khan died in 1227 AD, and left his empire to his third son, Ogedei. Ogedei made alliances with the Sung Dynasty to get control of northern China from the Jurchen in 1234. He and his sons and grandsons expanded his empire to include Kievan Rus to his west and Persia to his south. By 1241, the Mongols conquered Poland and Hungary.
Ogedei died from drinking too much wine in that same year, 1241 AD, when he was 55 years old. Ogedei's widow, a Christian woman named Toregene, took over ruling the Mongol Empire. Toregene's main assistant was also a woman: Fatima, a Persian Shiite woman. Toregene and Fatima built churches, mosques, and schools all over the Mongol empire. Torogene's generals attacked and looted Sung Dynasty China, and won the battle of Kose Dag over the Seljuks and the Romans in 1243.
To find out more about the Mongol Empire, check out these books from Amazon or from your library: