 As an incentive to join the Confederation, it was stated that any state which joined could mediatise their neighbours.Prince Charles of Isenburg-Birstein joined the Confederation and was granted the mediatized Isenburgian Countships of Isenburg-Büdingen, Isenburg-Meerholz, Isenburg-Philippseich, and Isenburg-Wächtersbach.His Principality was renamed to Isenburg.