Ketteler and also Kettler is the name of a German noble family of Westphalia. Goswin Ketteler zu Assen (c. 1400 – c. 1471) divided the property with his younger brother Röttger around 1440. He built a new house on his part of the ground and called himself since then Kettler Neu Assen. He changed the background of his coats from silver to gold - the so-called golden line. The silver line still spells Ketteler and is called the silver line Ketteler Alt Assen.