Final answer:
The noun in the sentence 'Genghis Khan was a ruler of the Mongols in the early 1200s' is 'Genghis Khan,' and 'Mongols' with no pronouns present. Genghis Khan unified the Mongol tribes and led a powerful military, leaving a lasting impact on Mongol national identity.
Step-by-step explanation:
In the sentence 'Genghis Khan was a ruler of the Mongols in the early 1200s,' the noun is Genghis Khan, which is a proper noun referring to a specific historical figure. The noun Mongols is a common noun representing the people under Genghis Khan's rule. There are no pronouns in the sentence as all the nouns are directly mentioned and no words are used to replace them.
Genghis Khan, born Temüjin, united the Mongol tribes and created a vast empire in the 13th century. Under his leadership, the military became a sophisticated war machine that engaged in successful raids and deadly sieges. The Mongol Empire brought about substantial change in the regions it conquered, creating a legacy that deeply influences national identity among Mongols to this day.