What year marks the beginning of Genghis Khan's conquest of Asia?

The year that marks the beginning of Genghis Khan's conquest of Asia is 1206, which is significant for several reasons. In this year, Genghis Khan was proclaimed the leader of the Mongol tribes after a series of unifications. This unification laid the groundwork for his subsequent military campaigns and the expansion of the Mongol Empire. Genghis Khan's leadership was instrumental in the establishment of a highly organized and effective army, which he began to deploy in raids and conquests shortly after this event.

1206 is also notable because it signifies the moment Genghis Khan set into motion his plans to invade neighboring territories, which ultimately led to the Mongol conquests that reshaped vast regions of Asia and beyond. The Mongol Empire would expand rapidly, influencing trade routes, cultures, and political boundaries across Eurasia.

In contrast, the other years mentioned—1453, which marks the fall of Constantinople; and AD 800, associated with Charlemagne's reign—are significant in different historical contexts but do not relate to Genghis Khan's campaigns. The year 1215 is also not correct because it refers to a significant event in the Mongol invasions of China, which occurred after Genghis Khan