 This was possibly in connection with the War of the Thuringian Succession.Landgrave Henry I built a castle at Eisemroth (the present-day administrative center of Siegbach) in 1307-1308 for protection against Nassau.On 9 November 1309, the Dernbachers sold their home castle, the small water castle Alt-Dernbach, to the new Landgrave Otto I and received it back as a fiefdom.