"Rudolph Augustus (May 16, 1627 – January 26, 1704), a member of the House of Welf, was Duke of Brunswick-Lüneburg and ruled as Prince of Brunswick-Wolfenbüttel ...
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from 1666 until his death. In 1685 he made his younger brother Anthony Ulrich co-ruler." - (en.wikipedia.org 31.01.2020)