Morganatic

Francis Ferdinand's marriage was a morganatic alliance, and in consequence of a declaration which he made when contracting it, his children do not inherit his rights to the Austrian crown.

we have this day repudiated our former spouse and have bestowed our royal hand upon the princess Selene, the splendour of the night. (The former morganatic spouse of Bloom is hastily removed in the Black Maria.)

Because of her noble birth, she bitterly resented her position as a morganatic wife.

Louis's association with the pious widow, Madame de Maintenon (with whom he contracted a morganatic marriage in 1684) had led to a new tone of piety, even prudery, at court.

This will not be a morganatic marriage—one where titles are not passed to any children—the prince and Mrs Parker Bowles being beyond the usual age of procreation and so unlikely to have new heirs to complicate matters.

After her death, he arranged a morganatic marriage with Anna in 1757, which made him even more vulnerable to charges of sexual impropriety.