Concubines

n.

妾，妃子( concubine的名词复数 )；

Concubines in Sung China
The market in concubines in Jiangnan during Ming-Qing China
Clerical "concubines"in northern Italy during the fourteenth century.
From Concubines to Capitalists: Women, Property, and Power in Eighteenth-Century Cairo
Wives, Concubines, and Maids: Servitude and Kinship in the Hong Kong Region, 1900–1940
Queens, Concubines, and Dowagers: The King's Wife in the Early Middle Ages by Pauline Stafford
‘Like man and wife’: clerics’ concubines in the diocese of Barcelona
Black women, are you aware that you are concubines? The legal implications of South African family law
Of ‘Spinsters,’‘Concubines’ and ‘Wicked Women’: Reflections on Gender and Social Change in Colon...
The Relation between Empresses and Imperial Concubines Remonstrance and Clear and Bright Politics at the Beginning of the Tang Dynasty