What is the most harmonious harem in the history of China?

Emperor with the fewest concubines: Emperor Xiaozong of Ming Dynasty, who married only one queen, Zhang, and had no other concubines. Zhu Shitang, the ninth emperor of the Ming Dynasty and the third son of Zhu Jianshen, Ming Xianzong, was born to Empress Xiao Muji. Historians of all previous dynasties spoke highly of him. Zhu Guozhen, a Record of the Cabinet during the Wanli period of the Ming Dynasty, said: "Under three generations, the sages were Emperor Wen of the Han Dynasty, and I was Ming Xiaozong.