
This in turn explains the rarity of such unions. That being said, they oftened hapenned for a very specific set of reasons, usually to allow the dynasty to survive, and they required an agreement between both families and sometimes their liege lord (in the case I mentionned, the King of France had to give his approval). So Matrilineal marriage were possible historically. An example I can name right away, though it's from the XVIIIth Century, is that of princess Louise Hippolyte of Monaco: she married Jacques François Goyon, count of Matignon but the children took the name of Grimaldi to allow the dynasty to survive.

Click to expand.A-historical isn't the word I would use as there were rare instances of children taking the dynastic name of their mother in European history.
