Some time ago we dedicated an article to the frumentarii and agentes in rebus, who constituted what we might consider the Roman Empire's secret services, although in reality that body performed more functions - including postal and supply duties - because, after all, we're talking about another era.
Throughout the history of the Roman Empire, countless legions were raised and disbanded, but one legion endured the entirety, remaining in service to the Roman Empire and the Byzantine Empire, and marching on into the Middle Ages - The Legio V Macedonica. - HeritageDaily - Archaeology News
Apollonia in Cyrenaica (modern Libya) was founded by Greek colonists and became a significant commercial centre in the southern Mediterranean, which continued
Hadrian’s Wall (Vallum Aulium) was a defensive fortification in Roman Britannia that ran 73 miles (116km) from Mais at the Solway Firth on the Irish Sea to the banks of the River Tyne at Segedunum at Wallsend in the North Sea.
The purpose of the walls construction varies, some theories by archaeologists suggest that it was an expression of Rome’s power to solidify Hadrian’s policy of defence. On Hadrian’s accession to the throne in AD 117, there was unrest in parts of the Empire, including Judea, Libya, Egypt, and Mauretania which may have persuaded Hadrian to strengthen frontier borders.