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Glevum (or, more formally, Colonia Nervia Glevensium, or occasionally Glouvia) was a Roman fort in Roman Britain that became a "colonia" of retired legionaries in AD 97. Today it is known as Gloucester, located in the English county of Gloucestershire. The name Glevum is taken by many present day businesses in the area and also by the 26-mile Glevum Way, a long-distance footpath or recreational walk encircling modern Gloucester. 
Glevum was established around AD 48 as a market centre at an important crossing of the River Severn and near to the Fosse Way, one of the important Roman roads in Britain. Initially, there was a Roman fort established at Kingsholm. Twenty years later, a larger replacement fortress was built on slightly higher ground nearby, centred on Gloucester Cross, and a civilian settlement grew around it. The Roman Legion based here was the Legio II Augusta as they prepared to invade Roman Wales between 66 and 74 AD, later being based at Burrium (Usk) and Isca Augusta (Caerleon) in South Wales.
In AD 97, the whole area was designated a colonia by the Emperor Nerva. A colonia was the residence of retired legionaries and enjoyed the highest status in the Empire. The legionaries were given farmland in the surrounding district and could be called upon as a Roman auxiliary armed force.
Roman Britain was divided into four provinces in the early 4th century. It is most likely that Glevum, as a colony, became the provincial capital of Britannia Secunda, in the same way that colonies at York and Lincoln became capitals of their respective provinces. There is some evidence that at this time Glevum possessed a mint.
At its height, Glevum may have had a population of as many as 10,000 people. All the area around Glevum was intensely romanised in the second and third centuries, with a higher than normal distribution of villas, as a result of its suitability for the traditional intensive Roman farming methods.
Excavations at the New Market Hall showed that Romano-British occupation of the town may have continued in some form into the sub-Roman period, even if the town's population was greatly reduced. A new portal in the wall was made at the beginning of the sixth century, showing a modest growth of the town after the Battle of Mons Badonicus of 497.
The Anglo-Saxon Chronicle records a King Coinmail (according to the original A-text), who may have come from Gloucester, taking part in the Battle of Dyrham in 577, when the city was conquered by the Anglo-Saxons.