Straße der Romanik
Lothair had a collegiate church and cloister built within the Supplinburg palace about 1130. In 1173 his grandson Henry the Lion granted Süpplingenburg to the Knights Templar order, from which it fell to the Knights Hospitaller in 1357. It remained a commandry ("Komturei") of the Order of Saint John until in 1820 it was finally mediatised to the Duchy of Brunswick. The castle was demolished about 1875, while the St John Church survived, today a stop at the scenic Romanesque Road.