won sole possession of the city of Limburg and took the title Gelach I, Count of Limburg. The relationship between the Counts of Limburg and the citizenry of the city was tense. In 1279 the citizens expelled Gerlach I from the city. After negotiations, he was able to return to his castle, but he had to grant the citizenry far-reaching freedoms. In 1288, Gerlach participated together with Nassau and Westerburg at the Battle of Worringen on the side of the Archbishop of Cologne, Siegfried II of Westerburg. The dynasty of the House of Limburg was active on behalf of the German kings. In particular, John I worked from 1292 to 1298 for his brother-in-law, King Adolf of Nassau, who was married to John's sister Imagina of Isenburg-Limburg. Despite his participation in the Battle of Göllheim on the side of King Adolf, he was later able to gain the favor of Adolf's opponent and successor, King Albert of Habsburg. The city of Limburg an der Lahn was strategically important due to its location on the main trade route from Cologne to Frankfurt. This led to frequent conflicts with neighbouring lordships and made the city a target of robber-barons. As a result, the city was heavily fortified by the Counts of Limburg. Towers were built around the city in 1315. In 1343 walls and a moat were added to surround the town. Under Gerlach II, the city of Limburg achieved its highest medieval flowering. The chronicler Tilemann Elhen von Wolfhagen writes in his chronicle of Limburg before 1402 that, before the plague, the city could summon over 2,000 weapons-capable citizens. Gerlach constructed the stone bridge over the Lahn and laid out suburbs in front of the Dietz and Frankfurt Gates and the approach to the bridge. With a fire in 1342 and the first wave of the Black Death in 1349, however, began its economic decline. In 1344 half of the castle, town and lordship was pledged to Baldwin of Luxembourg, Archbishop of Trier. In 1374 Limburg's imperial sovereignty also fell to Trier. In 1365, Gerlach III died in the plague without male heirs. With the permission of Pope Urban V, his brother John put aside the office of Canon of Trier Cathedral and took over the rule of Limburg as John II. John II died in 1406 as the last male representative of the House of Limburg. The Archbishopric of Trier