"John Frederick (German: Johann Friedrich; 25 April 1625 in Herzberg am Harz – 18 December 1679 in Augsburg) was duke of Brunswick-Lüneburg. He ruled over the Principality of Calenberg, a subdivision of the duchy, from 1665 until his death.
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." - (en.wikipedia.org 01.02.2020)
