The Templerhof at Koblenzer Straße 45, built by members of the Templar Brotherhood, was first mentioned in 1215. In 1245, the Donatus Chapel was erected on the Rhine side of the Templerhof, where the brotherhood kept a valuable relic of the Holy Cross. Today, this cross is housed in St. Mary’s Church. The red cross on a white background, symbol of the brotherhood, was adopted by the Knights of Malta and can still be seen on the frames of the windows facing Tempelgasse. During the Thirty Years' War (1618-1648), the Templerhof was destroyed and rebuilt in 1657.