They were open borders which anyone could cross unless opposed by superior force. Like any border. They were also long - from the Rhine-Danube across Europe, through Asia Minor, the Middle East and along all of North Africa.
This is a rarher big ask requiring more soldiers than Rome could possibly maintain. Force had to be supplemented by diplomacy where this could work. The emperors from Augustus onwards used both, but as the centuries wore on, the masses of peoples moving across from the east overwhelmed the defences.
The reasons for the fall of the Roman empire can loosely be divided into two parts -- corruption and lethargy from within and pressures on the borders from without.
Of course it is. after Romans conquer all the Greek city states, Macedonia is found among them. Until 1453 when ottomans invade Byzantines, they also conquer the weak Slavic kingdoms of the north, Macedonia lies inside the eastern roman empire's borders, aka byzantine empire or Greek empire.
It probably got too big to defend its borders.
The stationed the bulk of the Roman legions in the frontier provinces of the empire.
At times during the Roman empire the Germanic tribes within the empire's borders or outside of them, attacked Roman legions or guardposts. Some became part of the Roman military as auxiliaries. Some were trained by the Romans and then used that training against Rome. Finally at the end of the empire the Germanic tribes were some of many barbarians that settled within the old Roman borders. Rome was in the end unable to defeat Germanic tribes in war.
The Senate was in partnership with the Emperor and made necessary decisions for the empire to run smoothly and defend its borders.
The reasons for the fall of the Roman empire can loosely be divided into two parts -- corruption and lethargy from within and pressures on the borders from without.
Of course it is. after Romans conquer all the Greek city states, Macedonia is found among them. Until 1453 when ottomans invade Byzantines, they also conquer the weak Slavic kingdoms of the north, Macedonia lies inside the eastern roman empire's borders, aka byzantine empire or Greek empire.
Roman Empire fell, and divided among weak kingdoms.
Rhine, Danube and for part of the time, Euphrates.
jerusalem, palestine and syria.
It probably got too big to defend its borders.
no leaders
no leaders
the roman army was weak so it could not defend the empire from barbarians who attacked it in the twilight of Rome (Rome was captured in 476 AD by a barbarian named Odacer)
The stationed the bulk of the Roman legions in the frontier provinces of the empire.
The stationed the bulk of the Roman legions in the frontier provinces of the empire.