Roman troops, mainly from nearby provinces, invaded in AD 43, in what is now part of England, during the reign of Emperor
Claudius. Over the next few years the province of
Britannia was formed, eventually including the whole of what later became England and Wales and parts of Scotland. The Claudian army took over
Colchester and eleven tribal kings of Britain also surrendered to the Roman army. By AD 47, the Romans had invaded southern Britain and claimed territory that held many natural resources. This led to an increase in imperial wealth. The Romans developed the city of Colchester through urbanisation and new clusters of public buildings. The
Roman army and their families and dependents amounted to 125,000 people, out of Britannia's total population of 3.6 million at the end of the fourth century. There were also many migrants of other professions, such as sculptors (Barates) from
Roman Syria and doctors from the
Eastern Mediterranean region. Romano-British cultures and religions continued to diversify; while the populace remained mainly Celtic, there was an increase in
Romanisation. The bulk of the population was rural and engaged in agriculture; from a total population of 3.6 million at the end of the fourth century, the urban population was about 240,000 people, Londinium was an ethnically diverse city with inhabitants from across the Roman Empire, including natives of Britannia, and immigrants from
continental Europe, the Middle East, and
North Africa. There was also cultural diversity in other Roman-British towns, which were sustained by considerable migration, both within Britannia and from other Roman territories, including North Africa, Syria, the Eastern Mediterranean, and continental Europe.
Roman citizenship One aspect of Roman influence seen in British life was the grant of
Roman citizenship. At first this was granted very selectively: to the council members of certain classes of towns, whom Roman practice made citizens; to veterans, either
legionaries or soldiers in
auxiliary units; and to a number of natives whose
patrons obtained citizenship for them. The granting of Roman citizenship was gradually expanded and more people from provinces became citizens. One way for a provincial inhabitant to become a citizen was to serve in the Roman army or a city council. The number of citizens steadily increased, as people inherited citizenship and more grants were made by the emperors. Eventually in 212 or early 213 AD, everybody living in the provinces except slaves and
freed slaves were granted citizenship by the
Constitutio Antoniniana. The other inhabitants of Britain, who did not enjoy citizenship, the
Peregrini, continued to live under the laws of their ancestors. Principal handicaps were that they could not own land with a Latin title, serve as a
legionary in the army, or, in general,
inherit from a Roman citizen. These surrendered foreigners were not provided with any of the benefits, duties, status or sense of identity of citizens. Romans continued to stigmatize
peregrini dediticii as freedmen or foreigners who were tortured and excluded from citizenship forever. ==Roman departure from Britain==