An old one:
For a long time, the gossip or perhaps the wish was that at the time Crown Prince Felipe of Spain with Princess Tatjana of Liechtenstein (youngest child and only daughter Prince Hans Adam II and Princess Marie) or Princess Carolina of Bourbon-Parma (youngest child and 2nd daughter of Prince Carlos-Hugo, Duke of Parma and Princess Irene of the Netherlands). He surprised everyone by marrying Spanish journalist Letizia Ortiz Roscalano.
Well she was divorced in a catholic country so that might have been an issue.... I guess it works for them but in reality not “suitable” for the old aristocracy