Grenzau Castle

Grenzau Castle is a ruined spur castle at near Höhr-Grenzhausen in the county of Westerwaldkreis in the state of Rhineland-Palatinate. It is the only castle in Germany with a triangular bergfried.HistoryThe castle was built by Henry I of Isenburg around 1210 as Burg Gransioie, Old Fr. for "great joy" (Fr.: grande joie), from which its name developed through Gran Joie (1238), Gransoge (1275), Grensoy(ge) (1331, 1343, 1346), Grensawe (1356), La Grange (1525), Grensove, Grensauwe, Grentzawe and finally Grenzau. The castle is first recorded in a document dated 6 January 1213 that states the Isenburgs had flouted the rights of Laach Abbey. In 1324 the middle line of the lords of Isenburg-Grenzau lived at the castle.In 1346, Archbishop Baldwin of Trier captured the castle during the Grenzau Feud. In 1347, in spite of his victory at Gumschlag over the citizens of Koblenz, Philip I had to recognise its feudal lordship. Emperor Charles V awarded Frankfurt town rights to Grenzau. In 1439, the older Salentine line of the lords and counts of Isenburg lived at the castle. In 1460 the castle was returned to Gerlach II by Electoral Trier. In 1557 the younger Salentine line of Isenburg counts lived here and reinforced the fortifications with artillery bastions in the north and a roundel on the southern hillside.