Equal marriages have never been compulsory in France. Philomena has noble ancestry through her mother. Her family is not Royal or one of the high noble families of Europe but compared to the wives of other contemporaries of Jean she is closer to Queen Mathilde than to Queen Letizia or the Duchess of Cambridge when it comes to background.
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Hopefully nobody was unpleasant about it. After all, he did make an effort to marry royally. Seeing pics of Jean and family, it seems obvious that his wife is the perfect spouse for him.