@incollection{SIEBER-LEHMANN, address = {Zürich}, author = {Sieber-Lehmann, Claudius}, booktitle = {Grenzen und Raumvorstellungen (11.-20. Jh.). Frontières et conceptions de l’espace (11e-20e siècles)}, editor = {Marchal, Guy P.}, interhash = {f444a7317ebe58a79a981caf829ca3fd}, intrahash = {8fc9207af17b34739827da6783a16ce7}, pages = {79-91}, series = {Clio Lucernensis 3}, title = {“Regna colore rubeo circumscripta”. Überlegungen zur Geschichte weltlicher Herrschaftsgrenzen im Mittelalter}, year = 1996 }