The Tatars, formerly also spelt Tartars, is an umbrella term for different Turkic ethnic groups bearing the name "Tatar" across Eastern Europe and Asia. Initially, the ethnonym Tatar possibly referred to the Tatar confederation. That confederation was eventually incorporated into the Mongol Empire when Genghis Khan unified the various steppe tribes. Historically, the term Tatars was applied to anyone originating from the vast Northern and Central Asian landmass then known as Tartary, a term which was also conflated with the Mongol Empire itself. More recently, however, the term has come to refer more narrowly to related ethnic groups who refer to themselves as Tatars or who speak languages that are commonly referred to as Tatar.

Genghis Khan, also Chinggis Khan, was the founder and first khan of the Mongol Empire, which he ruled from 1206 until his death in 1227; it later became the largest contiguous empire in history. After spending most of his life uniting the Mongol tribes, he launched a series of military campaigns, conquering large parts of China and Central Asia.