This volume presents a series of studies by Jacqueline Caille, acknowledged as the leading expert on medieval Narbonne, which chart the development and history of the city from its Roman origins to its decline in the late Middle Ages. They focus on the period of Narbonne’s heyday, from the mid-11th to the mid-14th centuries, and a central place is held by Ermengarde, viscountess for half the 12th century, and celebrated figure in the ‘world of the troubadours’. The book opens with an important new introductory survey, in English, setting the context for the detailed studies which follow, several of which also appear in English for the first time, and all being updated with additional notes. These articles cover the physical growth of the great medieval centre, the relations and conflicts between its secular and ecclesiastical lords, its administrative and religious life, and its political and commercial connections with the areas around. Ce volume regroupe une serie d'etudes de Jacqueline Caille, specialiste reconnue de l'histoire de Narbonne au Moyen Age. L'antique cite y est presentee depuis ses origines romaines jusqu'A la fin du XVe siecle, en insistant particulierement sur la periode la plus brillante des siecles medievaux, du milieu du XIe au milieu du XIVe siecle. Le recueil s'ouvre par un long survol historique inedit, en anglais, brossant le contexte general oA(1) s'inserent les etudes specialisees qui suivent, reactualisees par des notes additionnelles. Les principaux themes pouvant Atre degages des ces articles concernent le developpement topographique de cette grande ville medievale , les relations et les conflits entre les seigneurs qui la dirigent (archevAques et vicomtes), la vie administrative et religieuse de l'agglomeration ainsi que ses relations politiques et commerciales avec les regions environnantes. Enfin, une place de choix est faite A l'une des eminentes figures du monde des troubadours , la victomtesse