In 61, Boadicea, Queen of the Iceni, revolted against the Roman yoke, sacked London and Colchester, but was defeated near the former city, and took poison rather than fall into the hands of the victors. Agricola became governor in 78, and subjected to his rule the Ordovices Nivales. Not long after, he attacked the Brigantes and Galgacus. In 120, Hadrian was engaged in building the Roman or Pict wall between the Tyne and Solway Frith, which has for so long borne his name. Nineteen years later, Tollius Urbicus constructed the rampart, called the Wall of Antonine (Antoninus Pius 86-161), along the line of Agricola's forts, built between the Forth and the Clyde, to overawe the wild tribes to the north. This wall is now known by the name of Graeme's Dyke. In 207 onwards, Severus built a new wall along the line of Hadrian's rampart. He died at York in 211. The years 287, 288, saw the reigns of Carausius and Allectus. In 296, Constantius Chlorus regained Britain for Rome. He also died at York in 306. In 307 the Picts and Scots overran the country as far as London. The General Theodosius was sent to oppose them, and drove them back beyond Valentia, the fifth Roman division northwards. The title of Emperor was assumed by Maximus in 383, but he was put to death in 388. Stilicho, the general of Honorius, transferred one legion from Britain into Gaul. This weakened the defence of the land against the northern tribes, as the legion never returned. At this epoch ever-growing confusion and division manifested themselves within the Roman Empire, whereupon its hold on distant provinces grew weaker and weaker. At one period there were as many as six Emperors contending with one another for the sole authority; and in 410, the year in which Rome was sacked by the Goths under Alaric, the Roman occupation was terminated according to the terms of a letter addressed by Honorius to the cities of Britain. EARLY HISTORY. Nothing very specific can be said about the settlements of the Celtic inhabitants of these islands before the coming of Caesar. The country must have been largely covered by forests and intersected by fens. Different tribes occupied different centres and were nomadic according to the season of the year. Barter was common, and there must have been facilities for the distribution of those goods which had their origin in Gaul. An export trade, too, was actively carried on in regard to such metals as tin, which were borne in rude conveyances along well-defined trackways wrought out along the sheltered sides of hills. Certain spots--woods, hills, wells--from their size, shape, position, or some accidental association, were regarded as sacred, and became the centres of religious worship, of sacrifice, and of schools of priests. Thus we have--then, or in somewhat later times--Bangor, Mona, or the Isle of Augury, Stonehenge, Avebury, etc.