The hierarchy of Chinese emperor’s harem—Tang Dynasty(1) The emperor has one wif
The hierarchy of Chinese emperor’s harem—Tang Dynasty(1) The emperor has one wife and many concubines. His wife is empress; his concubines have differential titles according to the rank. The empress is the leader of harem, and her first son has the right to succeed to the throne. Fei（妃）is the highest title among the concubines. -- source link
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