"Leiningen is the name of an old German noble family whose lands lay principally in Alsace, Lorraine and the Palatinate. Various branches of this family developed over the centuries and ruled counties with Imperial immediacy.
Most of these counties were annexed by the First French Republic in 1793, after French troops conquered the Left Bank of the Rhine during the War of the First Coalition. Several family branches subsequently received secularized abbeys as compensation, but shortly afterwards, these new counties were mediatized and the family lost its immediacy. Today, the only existing branch is that of the Princes of Leiningen." - (en.wikipedia.org 16.12.2019)
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