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By the year 47, when Plautius was succeeded as commanding officer by Ostorius Scapula, a frontier had been established from Exeter to the Humber, based on the road known as the Fosse Way; from this fact it appears that Claudius did not plan the annexation of the whole island but only of the arable southeast. The intransigence of the tribes of Wales, spurred on by Caratacus, however, caused Scapula to occupy the lowlands beyond the Fosse Way up to the River Severn and to move forward his forces into this area for the struggle with the Silures and Ordovices. The Roman forces were strengthened by the addition of Legion XX, released for this purpose by the foundation of a veteran settlement (colonia) at Camulodunum in the year 49. The colonia would form a strategic reserve as well as setting the Britons an example of Roman urban organization and life. A provincial centre for the worship of the emperor was also established. Scapula’s right flank was secured by the treaty relationship that had been established with Cartimandua, queen of the Brigantes. Hers was the largest kingdom in Britain, occupying the whole area between Derbyshire and the Tyne; unfortunately it lacked stability, nor was it united behind its queen, who lost popularity when she surrendered the British resistance leader, Caratacus, to the Romans. Nevertheless, with occasional Roman military support, Cartimandua was maintained in power until 69 against the opposition led by her husband, Venutius, and this enabled Roman governors to concentrate on Wales.

By ad 60 much had been achieved; Suetonius Paulinus, governor from 59 to 61, was invading the island of Anglesey, the last stronghold of independence, when a serious setback occurred: this was the rebellion of Boudicca, queen of the Iceni. Under its king Prasutagus the tribe of the Iceni had enjoyed a position of alliance and independence; but on his death (60) the territory was forcibly annexed and outrages occurred. Boudicca was able to rally other tribes to her assistance; chief of these were the Trinovantes of Essex, who had many grievances against the settlers of Camulodunum for their arrogant seizure of lands. Roman forces were distant and scattered; and, before peace could be restored, the rebels had sacked Camulodunum, Verulamium (St. Albans), and London, the three chief centres of Romanized life in Britain. Paulinus acted harshly after his victory, but the procurator of the province, Julius Classicianus, with the revenues in mind and perhaps also because, as a Gaul by birth, he possessed a truer vision of provincial partnership with Rome, brought about his recall.

In the first 20 years of occupation some progress had been made in spreading Roman civilization. Towns had been founded, the imperial cult had been established, and merchants were busily introducing the Britons to material benefits. It was not, however, until the Flavian period, ad 69–96, that real advances were made in this field. With the occupation of Wales by Julius Frontinus (governor from 74 to 78) and the advance into northern Scotland by Gnaeus Julius Agricola (78–84), troops were removed from southern Britain, and self-governing civitates, administrative areas based for the most part on the indigenous tribes, took over local administration. This involved a large program of urbanization and also of education, which continued into the 2nd century; Tacitus, in his biography of Agricola, emphasizes the encouragement given to it. Roman conquest of Wales was complete by 78, but Agricola’s invasion of Scotland failed because shortage of manpower prevented him from completing the occupation of the whole island. Moreover, when the British garrison was reduced (c. ad 90) by a legion because of continental needs, it became evident that a frontier would have to be maintained in the north. After several experiments, the Solway–Tyne isthmus was chosen, and there the emperor Hadrian built his stone wall (c. 122–130).

Condition of the province

There was a marked contrast in attitude toward the Roman occupation between the lowland Britons and the inhabitants of Wales and the hill country of the north. The economy of the former was that of settled agriculture, and they were largely of Belgic stock; they soon accepted and appreciated the Roman way of life. The economy of the hill dwellers was pastoral, and the urban civilization of Rome threatened their freedom of life. Although resistance in Wales was stamped out by the end of the 1st century ad, Roman influences were nonetheless weak except in the Vale of Glamorgan. In the Pennines until the beginning of the 3rd century there were repeated rebellions, the more dangerous because of the threat of assistance from free Scotland.

Army and frontier