This is a print on demand edition of a hard-to-find journal. Treats ancient sites and monuments in the northern Campus Martius. For centuries during the Republic the field of the god Mars lay outside the city of Rome on its northwestern limit. Some political activities and many religious activities took place there. Pompey and Caesar began to alter the aspect of the land with a theater and its great colonnade, a hall of assembly and on the edge of the city a new forum with a temple. Emp. Augustus and his son-in-law Agrippa quickened the process of urbanization with a building program, combined with efforts to bring the Tiber River under control. Here is the story of the development of the terrain from the end of the Republic to the onset of church bldg. Illus.