Its geography mostly looked like that of modern China, except with northern and western edges that varied. It was often attacked by northern nomadic people such as the Turkic tribes and the Mongols lead by Genghis Khan and Kublai Khan. During the history of ancient China, the northern nomadic people and the Chinese people had been fighting each other and taking turns to rule the land and the people of China. However, when the northern people beat the Chinese people and came to rule the kingdom, they also Incorporated the Chinese way of living and became like the Chinese. Many of the strongest dynasties of China were ruled by the northern people, including the Qin, Tang, Yuan (Mongolian), and Qing (Manchu). Each time, they also brought new elements into the Chinese culture.