Gustav, 7th Prince of Sayn-Wittgenstein-Berleburg, is the eldest child and only son of Princess Benedikte of Denmark and Richard, 6th Prince of Sayn-Wittgenstein-Berleburg.
Sayn-Wittgenstein-Berleburg
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Sayn-Wittgenstein-Berleburg was one of several imperial counties and later principalities ruled by the House of Sayn-Wittgenstein.
Berleburg Castle
Richard, 6th Prince of Sayn-Wittgenstein-Berleburg and his wife Princess Benedikte of Denmark (2010)