- Medieval China had natural barriers like seas that protected it from invasion while also providing trade routes. Confucius was an influential philosopher from 551-479 BC whose teachings emphasized harmony. Zeng He was a Chinese explorer who led naval expeditions to Southeast Asia, India, Arabia and Africa in the 1400s. The junk was a type of Chinese sailing boat used for coastal trade, while inventions included the printing press, gunpowder, compass and movable type. The Mongols conquered China in 1279 under Kublai Khan but the Ming Dynasty expelled them in 1368 and established the Forbidden City in Beijing as their imperial palace. The Qing Dynasty was established by the Manchus in 1644 and ruled until 1912