The town has a history that can be traced back to the year 959, with the Montabaur fort castellum Humbacense. The Archbishop-Elector of Trier, Dietrich von Wied, who came back from a Crusade in the Holy Land about 1217, had the humbacense castle newly built and named it Mons Tabor for its similarity to Mount Tabor in Israel, said to be the place of the Transfiguration of Jesus. Out of this grew Montabaur. In 1291, King Rudolf von Habsburg (1218-1291) granted Montabaur, as well as Welschbillig, Mayen, Bernkastel and Saarburg, town rights, so that the village became a town with its own coat of arms and a town wall.