<P> Pax Romana (Latin for the "(Peace in Rome)") was the long period of relative peacefulness and minimal expansion by the Roman military force experienced by the Roman Empire after the end of the Final War of the Roman Republic and before the beginning of the Crisis of the Third Century . During this time, the Roman empire reached its peak land mass area and its population grew up to 70 million people . Since it was established by Augustus, it is sometimes called Pax Augusta . Its span was approximately 206 years (27 BC to AD 180), from the time of Augustus becoming emperor to the death of Emperor Marcus Aurelius . </P> <P> The Pax Romana is said to have been a "miracle" because prior to it there had never been peace for so many centuries in a given period of history . However, Walter Goffart wrote: "The volume of the Cambridge Ancient History for the years A.D. 70--192 is called' The Imperial Peace', but peace is not what one finds in its pages". Arthur M. Eckstein writes that the period must be seen in contrast to the much more frequent warfare in the Roman Republic in the 4th and 3rd centuries BC . Eckstein also notes that the incipient Pax Romana appeared during the Republic, and that its temporal span varied with geographical region as well: "Although the standard textbook dates for the Pax Romana, the famous "Roman Peace" in the Mediterranean, are 31 BC to AD 250, the fact is that the Roman Peace was emerging in large regions of the Mediterranean at a much earlier date: Sicily after 210 (BC); peninsular Italy after 200 (BC); the Po Valley after 190 (BC); most of Spain after 133 (BC); North Africa after 100 (BC); and for ever longer stretches of time in the Greek East ." </P> <P> The first known record of the term Pax Romana appears in a writing by Seneca the Younger in 55 AD . The concept was highly influential, and the subject of theories and attempts to copy it in subsequent ages . Arnaldo Momigliano noted that "Pax Romana is a simple formula for propaganda, but a difficult subject for research ." In fact, the "Pax Romana" was broken by the First Jewish--Roman War, the Kitos War (also in Judea, 115--117), the Bar Kokhba Revolt (also known as the Third Jewish--Roman War), the Roman--Parthian War of 58--63, Trajan's Roman--Parthian War of 113, the Dacian Wars, various battles with Germanic tribes, including the Teutoburg Forest, and Boudica's war in Britain in AD 60 or 61 . </P> <P> The Pax Romana began when Octavian (Augustus) defeated Mark Antony and Cleopatra in the Battle of Actium on 2 September 31 BC and became the Roman emperor . He became princeps, or first citizen . Lacking a good precedent of successful one - man rule, Augustus created a junta of the greatest military magnates and stood as the front man . By binding together these leading magnates in a coalition, he eliminated the prospect of civil war . The Pax Romana was not immediate, despite the end of the civil wars, because fighting continued in Hispania and in the Alps . Nevertheless, Augustus closed the Gates of Janus (a ceremony indicating that Rome was at peace) three times, first in 29 BC and again in 25 BC . The third closure is undocumented, but Inez Scott Ryberg (1949) and Gaius Stern (2006) have persuasively dated the third closure to 13 BC with the commissioning of the Ara Pacis . At the time of the Ludi Saeculares in 17 BC the concept of Peace was publicized, and in 13 BC was proclaimed when Augustus and Agrippa jointly returned from pacifying the provinces . The order to construct the Ara Pacis was no doubt part of this announcement . </P>

Who were the emperors during the pax romana