This volume brings together the results of the conference held on the occasion of the 1100th anniversary of the Bonn Treaty of 7 November 921, during which the West Frankish King Charles III and the East Frankish King Henry I met on the Rhine near Bonn. The contributors take this particular meeting of rulers as their starting point, contextualise it as a stage in the disintegration of the Frankish empire and take an interdisciplinary, comparative look at other pre-modern summit meetings. The case studies range from the third pre-Christian to the 17th post-Christian century.