Noun
A woman who cohabits with a man without being his wife; a paramour.
A wife of inferior condition; a lawful wife, but not united to the man by the usual ceremonies, and of inferior condition. Such were Hagar and Keturah, the concubines of Abraham; and such concubines were allowed by the Roman laws. Their children were not heirs of their father.
Source: Webster's dictionaryA concubine was a free woman, often dowered for marriage, and her children were legitimate and lawful heirs. Source: Internet
A son born of a concubine and king's great-great-grand son used title gun (군, 君, lit. Prince). Source: Internet
Augustine's mother had followed him to Milan and arranged a marriage for which he abandoned his concubine. Source: Internet
Agamemnon was forced to return Chryseis to end the plague, and took Achilles ' concubine Briseis as his own. Source: Internet
And the child of a concubine had to show filial duty to two women, their biological mother and legal mother–the wife of their father. Source: Internet
Another factor in Mustafa's survival is the influence of Kösem Sultan (Ahmed's favorite concubine), who may have wished to preempt the succession of Osman, Ahmed’s first-born son from another concubine. Source: Internet