John Wacher 
Roman World [PDF ebook] 

When originally published in 1987, this book was hailed as a landmark in the study of the Roman World. Now back in print with a new preface by the author, it is still the most comprehensive survey of the Roman World available. Ranging from the founding of Rome in the eighth century BC, and throughout the Empire and beyond this book will continue to be an essential resource on the subject for many years to come.