House of Leyen

Prior to 1660, Hugo Ernst (line Leyen-Adendorf) became Lord of Blieskastel and, in 1657, was created Reichsfreiherr (Imperial baron) von der Leyen.

With most of the count's territories lost to Napoleon France, Reichsgraf Philipp Franz still retained the county Geroldseck.

His mother's brother was Karl Theodor Anton Maria von Dalberg, who later became Prince-Primate of the Confederation of the Rhine and Grand Duke of Frankfurt.

In 1819 the principality's holdings were mediatized under Baden, although the title is still being nominally held by House von der Leyen.

Prince Philipp-Erwein IV the current head of the family is descended, amongst others, from Frederick II, Holy Roman Emperor, Vsevolod I of Kyiv, Hugh Capet, Eric the Victorious, Harold Godwinson, Pope Julius II and Pope Paul III.