This book examines the influence of architectural design in the conservation of historic buildings by discussing in detail an important building complex in Rome: the Temple of Venus and Rome, the monastery of Santa Maria Nova and the church of Santa Francesca Romana. As the most complete site in the Roman Forum that has reached our times with a rich architectural stratification almost intact, it is a clear product of continuous preservation and transformation and it has not been studied in its complexity until now. The Temple of Venus and Rome and Santa Francesca Romana at the Roman Forum unravels the original designs and the subsequent interventions, including Giacomo Boni's pioneering conservation of the monastery, carried out while excavating the Roman Forum in the early twentieth century. The projects are discussed in context to show their significance and the relationships between architects and patrons. Through its interdisciplinary focus on architectural design, conservation, archaeology, history and construction, this study is an ideal example for scholars, students and architects of how to carry out research in architectural conservation.