Pax Romana, by Adrian Goldsworthy, was a fun book detailing the idea of Pax Romana, or peace through Roman Imperialism. This is a concept that is often invoked or aped throughout history; we hear of Pax Americana, Pax Britannica and so forth, meaning that a global or regional hegemonic power has created a system of long-standing peace through a monopoly on violence. Goldsworthy looks at this idea in the Roman world. Rome, as we all know, was an Empire that ruled Southern Europe, Northern Africa, the Middle East, and parts of Britain, Germany and the Low countries for many hundreds of years. The blitz of Empire building for Rome lasted from the Republican era, into the first reign of the Principate, but then slowed to almost a stop, with only a few conquests of land in Britain, the Kingdom of Dacia, and some short lived border adjustments in the Middle East and Germany. Other than that, Roman imperial conquest mostly happened during the Republic.
Goldsworthy examines the concept of peace through Roman arms from multiple perspectives. He examines the theoretical concepts behind the expansion, from an administrative standpoint, as well as through the rationale of various actors (gleaned from writings). Conquest was prevalent in the Republic because the Senate would send one of their own to a province or territory to administer every few years. The Senator would have limited time to make an impact (and a fortune) in the province, and so would have to act fast to gain prestige (and maybe a Triumph!). One could administer a province competently, put its finances in order, fairly arbitrate justice and policy, OR... one could just invade a bunch of land and take plunder and bring it back for the glory of Rome!! This is often what happened. Goldsworthy does note that Rome during the Republican era was not always aggressive, and often responded to slights and raids as pretexts for war, but usually was tolerant of client kingdoms and tribes on its borders. Friends of Rome were treated quite well, and Rome would even send in troops to prop up allies and puppets on the borders, or more often arbitrate disputes between two different allies. Only when things got really rough, or when a particularly ambitious Senator was in charge of a few legions (think Pompey or Julius Caesar) was territory annexed. During the first reign of the Roman Principate - Augustus Caesar, territory was annexed for reasons of Imperialism. Most sources indicate that the borders were shored up for logistical reasons of Empire - the Balkans was consolidated to build land networks to Rome's Greek/Asian possessions, and Spain was consolidated as well. The borders of the Empire in Germany were pushed up to the Rhine, and so forth.
During the reign of the Emperors, Rome was mostly an Empire in holding. It rarely increased its territory - only on a few occasions. Goldsworthy notes that Emperors with an insecure legitimacy were often the ones to engage in this sort of conquest - the invasion and extension of Roman possessions in Britain, and the invasion of Dacia, as well as the failed campaigns extending the German frontier to the Elbe, or moving deeper into Parthia, are all examples. Goldsworthy examines the concept of Imperial limits in Rome, in terms of the ability to raise, finance and fund legions, border posts and the like. He also looks at it from the perspective of legitimacy - Roman emperors were more secure in their legitimate power then an elected Senator, and only needed to prove themselves on particular occasions. This, Goldsworthy posits, is a key reason why Rome stopped its aggressive campaigns into foreign lands.
Goldsworthy also looks at internal peace. Civil conflict was common during the end of the Republic, but this conflict did not lead to a pause in further annexations. On the contrary - the acquisition of Gaul, Turkey and much more came about during the end of Republic, when powerful Senators and families squabbled for ultimate power. Goldsworthy then compares this to the centuries leading up to Rome's final collapse. Civil conflict was ripe in the Empire, but this did not lead to territorial acquisition. Rome suffered from rebellion in many of the recently annexed territories- notably Gaul, Spain, Judea and in Germany, where it actually lost provinces permanently for the first time. Rome's existing provinces for much of their Roman history were garrisoned if they were rebellious (usually close to its point of annexation), but as time went on, legions would be pulled away, and sometimes disbanded, to support frontier garrisons. During its peak, Rome has a string of forts and walls across its entire frontier, controlling defensive points like the Rhine and Danube, or building features like Hadrian's Wall, to create stable points of static defense and border control to deter raids, armed migrations, and smuggling and banditry. This was a time of economic stability for most Roman citizens, and a world where violence was rare, homesteads secure, and social life was stable. Roman women, slaves and foreigners did not possess full rights, and could not (for the most part) break free from there socially constructed places within society. Even so, this was an era of stability for many within (and sometimes without) the Roman Empire - the Pax Romana, if you will.
Goldsworthy examines (posits) the reasons why Pax Romana came about, and by extension, how Imperial rule can often lead to stability. It is stability enforced by a monopoly on violence, and one that is often not tolerant of social mobility, but it is Pax nonetheless. The social situation, garrison life, politics and policy, administration and so forth are all examined. If I had a criticism of this book, it would be that it doesn't fully offer a compelling examination of the concept of Pax Romana, but instead historical perspective on the birth of Roman imperialism, and some refutation of both the Roman Admirers in schools of history, and the more recent influx of anti-Imperialist scholarship that examines Rome. Goldsworthy acknowledges the benefits of both concepts, but tries to keep the history firmly in line with what a Roman politician or statesperson, or average citizen for that matter, might think, feel and how they would interact with the concept. This is a pretty solid read on the subject nonetheless, and I would certainly recommend it to those interesting in reading up on Ancient Rome.