12). The governor who arrived to oversee the regaining of control over Britannia after Albinus' defeat, Virius Lupus, was obliged to buy peace from the Maeatae rather than fight them. According to James Fraser and Roger Mason, by the end of the 2nd century, the majority of Northern tribes had been merged in the Roman consciousness into either the Caledones or the Maeatae, leaving just those two tribes as the representatives of the region. The region itself had long been called Caledonia, and Malcolm Todd states that all residents were called Caledonians, regardless of tribal affiliations. The Caledonians are next mentioned in 209, when they are said to have surrendered to the emperor Septimius Severus after he personally led a military expedition north of Hadrian's Wall, in search of a glorious military victory. Herodian and Dio wrote only in passing of the campaign but describe the Caledonians ceding territory to Rome as being the result. Cassius Dio records that the Caledonians inflicted 50,000 Roman casualties due to attrition and unconventional tactics such as guerrilla warfare. Dr. Colin Martin has suggested that the Severan campaigns did not seek a battle but instead sought to destroy the fertile agricultural land of eastern Scotland and thereby bring about genocide of the Caledonians through starvation. By 210 however, the Caledonians had re-formed their alliance with the Maeatae and joined their fresh offensive. A punitive expedition led by Severus' son, Caracalla, was sent out with the purpose of slaughtering everyone it encountered from any of the northern tribes. David Shotter mentions Caracalla's dislike for the Caledonians and his wish to see them eradicated. Severus meanwhile prepared for total conquest but was already ill; he died at Eboracum (modern day York) in Britannia in 211. Caracalla attempted to take over command but when his troops refused to recognise him as emperor, he made peace with the Caledonians and retreated south of Hadrian's Wall to press his claim for the imperial title. Sheppard Frere suggests that Caracalla briefly continued the campaign after his father's death rather than immediately leaving, citing an apparent delay in his arrival in Rome and indirect numismatic and epigraphic factors that suggest he may instead have fully concluded the war but that Dio's hostility towards his subject led him to record the campaign as ending in a truce. Malcolm Todd however considers there to be no evidence to support this. Peter Salway considers