 In 1391, no less than 17 families agreed a "Burgfrieden" and by the 15th century the number of joint owners or "Ganerben" had risen to 56, with frequent changes of hand.The Archbishop of Mainz also tried, in 1405, to gain a foothold on the castle and supported its expansion financially.In order to hold a balance of power against Mainz, however, the joint heirs subordinated themselves in 1458 to Count Palatine Frederick I, on whose side they fought during the Mainz Diocesan Feud.