House of Welf
Augustus II (10 April 1579 – 17 September 1666), called the Younger (), a member of the House of Welf was Duke of Brunswick-Lüneburg. In the estate division of the House of Welf of 1635, he received the Principality of Wolfenbüttel which he ruled until his death. Considered one of the most literate princes of his time, he is known for founding the Herzog August Library at his Wolfenbüttel residence, then the largest collection of books and manuscripts north of the Alps.