On 30 January 1299, King Albert sealed a deed stating that the owed Emich and his wife 300 silver marks, using Nuremberg weights, see: Wirtembergisches Urkundenbuch, vol. 11, Kohlhammer, Stuttgart, 1913, Nr. 5226, Online
books.google.com
Ernst Hermann Münch: Geschichte des Hauses Nassau-Oranien, vol. 2, Jacob Anton Mayer, Aachen and Leipzig, 1832, pp. 287–288, Online