Severus by the early Christian community. This is based on the decree mentioned in the Historia Augusta, an unreliable mix of fact and fiction. Early church historian Eusebius described Severus as a persecutor. The Christian apologist Tertullian stated that Severus was well disposed towards Christians, employed a Christian as his personal physician and had personally intervened to save several high-born Christians known to him from the mob. Eusebius' description of Severus as a persecutor likely derives merely from the fact that numerous persecutions occurred during his reign, including those known in the Roman Martyrology as the martyrs of Madauros, Charalambos and Perpetua and Felicity in Roman-ruled Africa. These were probably the result of local persecutions rather than empire-wide actions or decrees by Severus. Military activity Africa (202) In late 202 Severus launched a campaign in the province of Africa. The legatus legionis or commander of Legio III Augusta, Quintus Anicius Faustus, had been fighting against the Garamantes along the Limes Tripolitanus for five years. He captured several settlements such as Cydamus, Gholaia, Garbia and their capital Garama—over south of Leptis Magna. The province of Numidia was also enlarged: the empire annexed the settlements of Vescera, Castellum Dimmidi, Gemellae, Thabudeos and Thubunae. By 203 the entire southern frontier of Roman Africa had been dramatically expanded and re-fortified. Desert nomads could no longer safely raid the region's interior and escape back into the Sahara. Britain (208) In 208 Severus travelled to Britain with the intention of conquering Caledonia. Modern archaeological discoveries illuminate the scope and direction of his northern campaign. Severus probably arrived in Britain with an army of over 40,000, considering some of the camps constructed during his campaign could house this number. He strengthened Hadrian's Wall and reconquered the Southern Uplands up to the Antonine Wall, which was also enhanced. Severus built a camp south of the Antonine Wall at Trimontium, probably assembling his forces there. Supported and supplied by a strong naval force, Severus then thrust north with his army across the wall into Caledonian territory. Retracing the steps of Agricola of over a century before, Severus rebuilt and garrisoned many abandoned Roman forts along the east coast, such as Carpow. Cassius Dio's account of the invasion reads: By 210 Severus' campaigning had made significant gains, despite Caledonian guerrilla tactics and purportedly heavy Roman casualties. The Caledonians sued for peace, which Severus granted on condition they relinquish control of