A royal mistress is the historical position and sometimes unofficial title of the extramarital lover of a monarch or an heir apparent, who was expected to provide certain services, such as sexual or romantic intimacy, companionship, and advice in return for security, titles, money, honours, and an influential place at the royal court. Thus, some royal mistresses have had considerable power, being the power behind the throne. The institution partly owes its prevalence to the fact that royal marriages used to be conducted solely on the basis of political and dynastic considerations, leaving little space for the monarch´s personal preferences in the choice of a partner.
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