"Frederick, Duke of Brunswick and Lüneburg, (28 August 1574 – 10 December 1648) was the Prince of Lüneburg from 1636 to 1648.
Frederick was born on 28 August 1574, the tenth child of William the Younger (Brunswick-Lüneburg) (1535–1592) and Dorothea of Denmark.
He became bishop´s adjutor in the Bishopric of Ratzeburg and was elected propst (provost) of the Archdiocese of Bremen.
Frederick belonged to the New House of Lüneburg.
He died on 10 December 1648." - (en.wikipedia.org 31.01.2020)