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The Roman conquest of Britain was the Roman Empire's conquest of most of the island of Britain, which was inhabited by the Celtic Britons. It began in earnest in AD 43 under Emperor Claudius, and was largely completed in the southern half of Britain by AD 87, when the Stanegate was established. The conquered territory became the Roman province of Britannia. Attempts to conquer northern Britain (Caledonia) in the following centuries were not successful. Following Julius Caesar's invasions of Britain in 54 BC, some southern British chiefdoms had become allies of the Romans. The exile of their ally Verica gave the Romans a pretext for invasion. The Roman army was recruited in Italia, Hispania, and Gaul and used the newly-formed fleet Classis Britannica. Under their general Aulus Plautius, the Romans pushed inland from the southeast, defeating the Britons in the Battle of the Medway. By AD 47, the Romans held the lands southeast of the Fosse Way. British resistance was led by the chieftain Caratacus until his defeat in AD 50. The isle of Mona, a stronghold of the druids, was attacked in AD 60. This was interrupted by an uprising led by queen Boudica, in which the Britons destroyed Camulodunum, Verulamium and Londinium. The Romans put down the rebellion. The conquest of Wales lasted until c. AD 77. Roman general Gnaeus Julius Agricola conquered much of northern Britain during the following seven years. In AD 84, Agricola defeated a Caledonian army, led by Calgacus, at the Battle of Mons Graupius. However, the Romans soon withdrew from northern Britain. After Hadrian's Wall was established as the northern border, tribes in the region repeatedly rebelled against Roman rule and forts continued to be maintained across northern Britain to protect against these attacks.