morganatical

Adjective

morganatic (not comparable)

1. Designating a marriage (or the wife involved) between a man of higher rank and a woman of lower rank, often having various legal repercussions (typically that such a wife has no claim on the husband's possessions or title). It was not an aspect of English law, but was common in other royal houses, especially in Germany.
   • 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.1914 June 29, “Assassination of the Austrian royal heir and wife”, in The Guardian