A concubine is a woman who lives with a man, but is lower in status than his wife or wives. A mistress is a woman having an affair with a married man.
'Concubine' is the most popular alternative for 'mistress'.
Concubine means prostitute. mistress. Consort.
You are close - the word is leman. My copy of Websters defines it as 'sweetheart' 'lover' 'mistress'
Normal treasure can be found almost anywhere but is no longer available for sale in the marketplace. Mistress treasure is a popular website for black/ebonic dating.
Historically, many men had a mistress or concubine. As did many women. It was an accepted lifestyle.There are circumstances where a partner will accept and even allow their partner to have a lover. Generally in today's societies it is not acceptable though it is not illegal. It may be grounds for a divorce.
I have only heard head mistress used as a fancy-Dan ( or danielle) synonym for a Principal of a school, usually all-girls. Headmaster is far more common. Headmasters usually teach as well as serve as adminstrators. I have never heard head Mistress as some sort of rank-title for a concubine in chief, as you make it out. Concubine is the fancy Dan term for (Mistress) in the sense of unmarried lover) Charlemagne had several, it would appear the King had a distrust of conventional marriage bonds. Concubines are discussed in the Bible. When I was a kid I thought they were pets akin to say, porcupines.
Galileo was a man and his mistress a woman
A concubine might more commonly be known as a mistress. In history, concubine's were in long term relationship's with men who were from a higher social class. One of the most famous examples of concubines in biblical history is that of Hagar. She was the maid of Sarah, the wife of Abraham, who gifted Hagar to Abraham because she was unable to have any children of her own. Hagar gave birth to Ishmael as a result of her relationship with Abraham.
The Concubine's Children was created in 1994.
The Magnificent Concubine was created in 1962.
The Concubine - novel - was created in 1966.
The Russian Concubine was created in 2007.