Principality of Lüneburg
The third son of George, Duke of Brunswick-Lüneburg, John converted to the Roman Catholic Church, the only member of his family to do so, in 1651. He received Calenberg when his elder brother George William inherited the Principality of Lüneburg. In 1666, he had a palace built in Herrenhausen near Hanover that was inspired by the Palace of Versailles and is famous for its gardens, the Herrenhausen Gardens.