• Source: John Frederick, Duke of Brunswick

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, as a result of a visit while in Italy to Saint Joseph of Cupertino. 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.
In 1667, he employed as his master builder the Venetian architect Girolamo Sartorio, who designed many buildings in the town, including the Neustädter Kirche, and was instrumental in the expansion of the Herrenhausen Gardens.
In 1676, John Frederick employed Gottfried Wilhelm Leibniz as Privy Councillor and librarian of the important ducal library. Thus began Leibniz's 40-year association with the House of Hanover, which resulted in three generations of Hanovers being patrons to one of the most eminent philosophers and mathematicians of Europe.




Children



John Frederick married Benedicta Henrietta of the Palatinate (14 March 1652 – 12 August 1730), daughter of Edward, Count Palatine of Simmern and Anna Gonzaga, on 30 November 1668. They had four daughters:

Anna Sophie (10 February 1670 – 24 March 1672), died in childhood;
Charlotte Felicitas (8 March 1671 – 29 September 1710), married Rinaldo d'Este, Duke of Modena
Henriette Maria (9 March 1672 – 4 September 1687), died unmarried;
Wilhelmina Amalia (1673 – 10 April 1742), married Joseph I, Holy Roman Emperor




Ancestry






Notes






References


Allgemeine Deutsche Biographie, vol. 14, p. 177-181
At the House of Welf site

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