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Wikipedia definition
1. Royal mistressA royal mistress is the historical position of a mistress to a monarch or an heir apparent. Some mistresses have had considerable power. These powerful mistresses have been usually dubbed as The "power behind the throne. " The prevalence of the institution can be attributed to the fact that royal marriages were until recent times conducted solely on the basis of political and dynastic considerations, leaving little space for the monarch's personal preferences in the choice of a mate.
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