The Chinese Ming Dynasty (1368-1644 AD) enjoyed a period of peace and prosperity under Taizu's rule. The Ming rebuilt portions of the Great Wall, constructed the Forbidden City in Beijing, and completed the Grand Canal for transporting grain. Zheng He led naval expeditions that extended Chinese influence into the Indian Ocean and possibly Iran. However, the Ming Dynasty later declined after inviting the Manchu people into China, who then took over and established the last Qing Dynasty, isolating China and causing it to fall behind technologically.