The book deals with the thermal complex built in Rome by the emperor Caracalla between 212 and 216/217 A. D., parts of which were finished by his successors Elagabal and Alexander Severus, and in particular with its architectural decoration columns with their bases and capitals, entablatures and other architectural parts in marble. The surviving elements and fragments are listed in a comprehensive catalogue by their function, sort of marble, their type and form, with single types of architectual elements emerging from the resulting groups. In the text these architectural elements are examined in two directions: Firstly about their position within the framework of the Roman architectural decorations, about models and parallels of the ornaments used and naturally also about their pecularities; a whole chapter deals with the capitals, treating especially the well-known figured capitals from the frigidarium and their importance for the representative character of the decoration mainly in the transverse axis of the thermal building. Secondly the measures of the single architectural parts are analyzed and grouped into different columnal orders, taking into consideration also older documentations from the Renaissance to the early 19th century. On the base of photogrammetric documentations of the single rooms, of other measurements, again of older drawings and insofar as they exist some photographs documenting the position of the finds at the moment of the excavation, the single reconstructed orders are assigned to their supposed locations. In a number of plates these proposed reconstructions are presented in computer-based drawings, the single architectural elements and fragments are documented in an extensive volume of illustrations.

English summary: The 271 letters in the register of the 11th year of the papacy of Innocent III, including earlier decretals, contain privileges and confirmations of possessions, political, judicial, theological and pastoral decisions and are addressed to recipients throughout Europe and the Middle East. The annotated critical edition replaces earlier faulty prints and indicates the legal relevance of the letters, many of which where included in decretal collections. The introduction describes the manuscript and the editorial principles, and a number of indices help to access the contents. Printed with the support of the Fund for the Promotion of Academic Research. German description: Die 271 Briefe im Register des 11. Pontifikatsjahrs Innocenz' III., darunter auch altere Dekretalen, enthalten Privilegien und Besitzbestatigungen, politische, rechtliche und theologisch-pastorale Entscheidungen und richten sich an unterschiedliche Empfanger in ganz Europa wie im Nahen Osten. Die kommentierte kritische Edition ersetzt fehlerhafte alte Drucke und weist die Rechtwirksamkeit der vielfach in Dekretalensammlungen aufgenommenen Briefe aus. Einleitend werden die Handschrift und die Einrichtung der Edition beschrieben. Der Band wird durch mehrere Indices erschlossen. Gedruckt mit Unterstutzung des Fonds zur Forderung der wissenschaftlichen Forschung (FWF).