Introduction to Mingde Gate: Mingde Gate, like Danfeng Gate and Zhuque Gate, is the highest-level five-door gate in the capital's establishment. It is truly the "first gate in the Sui and Tang Dynasties"; it was built in the second year of Kaihuang in the Sui Dynasty and the fifth year of Yonghui in the Tang Dynasty. It was rebuilt as the south gate of Chang'an City in the Tang Dynasty. Together with the Zhuque Gate of the Imperial City and the Chengtian Gate of the Palace City, it formed the north-south central axis of Chang'an City.