Knepper was the son of Dominique Knepper, and went to the University of Dole in Besançon, Burgundy. He studied for law, and was admitted to the Luxembourg bar on 23 May 1660. He became a judge by appointment of Louis XIV in 1687.
In 1661 he married Anna-Marguerite Trippel, the daughter of a shepherd from Thionville.
- This article is based on material from the Lëtzebuergesch Wikipedia.
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