From the invasion of Claudius in AD 43, Britannia was governed as a province of the Roman Empire. There are several probable reasons for Claudius’ (reigned AD 41-54) invasion, including a desire for military triumph to enhance his reputation at Rome, and the wish to exploit the island’s mineral and agricultural wealth. The next recorded visit of a reigning emperor to the province was that of Hadrian (reigned 117-138) in 122. He took great interest in cities and in building, but his greatest monument was the massive defence work, Hadrian’s Wall, which runs for 80 miles across northern England.
In the 3rd and early 4th centuries, when the power of the Empire was in decline, emperors visited Britannia to stop rebellion. From 208, Septimius Severus (reigned 193-211) campaigned with his sons and co-emperors, Geta and Caracalla, against tribes in the north, but died at Eboracum (York) in 211. In 306, similar circumstances led to one of the greatest rulers of the late empire, Constantine, being first proclaimed emperor while in England. His father Constantius, ruler of the Western Empire, died in Eboracum while on campaign with Constantine against the Picts, and Constantine was hailed as augustus by the troops. Medieval historians connected Constantine with England to such an extent that they said that his mother Helena had been born there.
https://en.wikipedia.org/wiki/Roman_conquest_of_Britain
