Answer: morganatic

AnswerCrossword Clue
MORGANATICKind of marriage.
MORGANATICOf a form of marriage
morganaticrelating to a marriage between people of unequal rank, the marriage being valid, the children legitimate, but unable to inherit the higher rank
morganaticof or pertaining to a form of marriage in which a person of high rank, as a member of the nobility, marries someone of lower station with the stipulation that neither the low-ranking spouse nor their children, if any, will have any claim to the titles or
morganaticpertaining to a form of marriage where a person of high rank weds someone of lower station without claim to the property of the high-ranking partner.