Emperor Otto III donated Biebrich and Mosbach in 991 the Selz monastery in Alsace. Gifts and awards were also given to feudal nobles and counts, and by the 12th Century the House of Nassau held count rights in and around Wiesbaden. Count Henry II of Nassau, 1198–1251, won Wiesbaden and the Königssondergau as imperial fiefdom in 1214. Also, the Lords of Eppstein penetrated by exploiting bailiwick rights, purchase and inheritance in the Königssondergau, where they became opponents of the Counts of Nassau.