When a "family detective" starts researching  “Royalty” connected to one’s family, there arises  women known as “Mistresses” and “Concubines”.  Most Kings had them. Do you know the difference in these terms or “titles”? A concubine can be part of a harem, or a “purchased” woman (slave), usually of inferior rank who cohabits for sexual relief, a “secondary wife”. A mistress is a lady who has a co…