 The name changed from de Indagine, Hayn, Hagen to Westernhagen.Already in 1123 (however first mentioned in documents in 1288) the lords of Berlingerode in the Eichsfeld district built the old moated Castle Hagen (Westernhagen Castle) near Berlingerode.Around 1300 some relatives, probably tribally related to the lords of Berlingerode, built Castle Osternhagen (Eastern Hagen) at Hundeshagen.