English description: Christians in Lebanon have been painting their churches ever since the time of Christ but their work is largely unknown. Presently, the larger study of Byzantine painting has barely touched upon medieval Lebanon and very little has been published on a closely connected group of paintings in medieval Syria. Most, but not all of the paintings that have survived to the present day in Lebanon and also in Syria belong to the 12th and 13th centuries during the Crusades, a period when the greatest historical developments were taking place. As long as this region remained unexamined, an understanding of the cultural history of the Mediterranean basin was incomplete. This study approaches Lebanese paintings from two aspects. In the first place, it describes 26 monuments still visible today. The main body of the text then discusses the paintings as a group, including chapters on history, architecture, iconography and style. These chapters explore and attempt to explain relationships between Lebanese painting and other paintings in contemporary, Christian communities. Ideas moved with great rapidity across the Mediterranean during the 12th and 13th centuries and the Lebanese frescoes reflect the vigorous and colourful society of Outremer. Among all historical circumstances since the fall of the Roman Empire, the Crusades had the most far-reaching impact on European history and culture. Arab history was not unaffected by the Crusades but the greater impulse was from the East to the West. There were momentous impulses that reached across the seas at this time, not the least of them being the burgeoning commerce of the silk route and the approach of the Mongols. Lebanese painting reflects changes of this kind during this period. They not only illumine our understanding of medieval history in the Mediterranean basin, but also our understanding of the East and the West we experience today. German description: Das Werk unternimmt eine Bestandsaufnahme aller erhaltenen mittelalterlichen Wandmalereien im Libanon und ist damit ein Standardwerk zum Thema. Seit dem fruhen Christentum wurden libanesische Kirchen mit Fresken ausgestattet, und auch wahrend der islamischen Zeit setzten die Maler ihre Tatigkeit fort. Aus der Zeit der Kreuzzuge stammen jedoch die meisten der im Libanon noch vorhandenen Wandmalereien. Nach einer einleitenden Darstellung der Monumente und ihres Zerfalls seit Beginn der Katalogisierungsarbeiten wird jedes Fresko und die ggf. zugehorige Inschrift detailliert beschrieben und mit mindestens einer Abbildung dokumentiert. Die folgenden Kapitel uber Geschichte, Architektur, Ikonographie und Stil setzen die Malerei des Libanon zu gleichzeitiger christlicher Kunst in anderen Gegenden in Beziehung. Wechselseitige Einflusse aus Zypern, Byzanz, Kappadokien, Palastina, Agypten und Syrien sind nachzuweisen.