courtesan -
A prostitute, especially one with high-status or wealthy clients.
Wikipedia
A courtesan was originally a woman courtier, which means a person who attends the court of a monarch or other powerful person. In feudal society, the court was the centre of government as well as the residence of the monarch, and social and political life were often completely mixed together. In Renaissance Europe, courtiers played an extremely important role in upper-class society.
OmegaWiki Dictionary
Ω
courtesan A woman who cohabits with an important man, but who is not his wife.
