In AD 83 or 84, the Caledonians, led by
Calgacus, were defeated at the hands of
Gnaeus Julius Agricola at
Mons Graupius, as recorded by Tacitus. Tacitus avoids using terms such as
king to describe Calgacus and it is uncertain as to whether the Caledonians had single leaders or whether they were more disparate and that Calgacus was an elected war-leader only. Tacitus records the physical characteristics of the Caledonians as red hair and long limbs. In 122 AD construction began on
Hadrian's Wall, creating a physical boundary between Roman controlled territory, and the land the Romans deemed as Caledonia. An effort by the Romans to invade and conquer Caledonia was likely made sometime during or shortly after 139 AD. In 142 AD, construction began on the
Antonine Wall roughly 100 km North of Hadrian's Wall in order to aid in the Roman push into Caledonian territory and to consolidate their conquest of southern Caledonian territory. The Romans later abandoned this wall (around 158) to return to Hadrian's Wall to the south. According to Malcolm Todd, the tribes of what is now Northern Britain and Scotland (probably including the Caledones) proved themselves to be "too warlike to be easily contained", leading to the extensive garrisons left by the Romans to contest the tribes. Fraser and Mason argue that the Caledones likely did not directly attack or harass the Romans during this time, but may have had minor conflicts with other tribes. In AD 180 the Caledonians took part in an invasion of Britannia, breached Hadrian's Wall and were not brought under control for several years, eventually signing
peace treaties with the governor
Ulpius Marcellus. This suggests that they were capable of making formal agreements in unison despite supposedly having many different chieftains. However, Roman historians used the word "Caledonius" not only to refer to the Caledones themselves, but also to any of the other tribes (both Pictish or Brythonic) living north of Hadrian's Wall, and it is uncertain whether these later were limited to individual groups or wider unions of tribes. It is possible that this was the peoples of
Brigantia rather than the Caledones. By the latter half of the 2nd century AD, the actual Caledones would have likely had the
Maeatae peoples between themselves and the Antonine Wall. During the reign of Commodus, a series of regular payments appear to have been made to the Caledonians by the Romans, continuing into the first few years of Severus' reign, according to John Casey. In 197 AD
Dio Cassius records that the Caledonians aided in a further attack on the Roman frontier being led by the Maeatae and the
Brigantes and probably inspired by the removal of garrisons on Hadrian's Wall by
Clodius Albinus. He says the Caledonians broke the treaties they had made with Marcellus a few years earlier (Dio lxxvii, 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 that the pressures on Caracalla were too high, and security of the Romans' northern frontier were secure enough to allow their departure. Nonetheless the Caledonians did retake their territory and pushed the Romans back to Hadrian's Wall. In any event, there is no further historical mention of the Caledonians for a century save for a c. AD 230 inscription from
Colchester which records a dedication by a man calling himself the nephew (or grandson) of "Uepogenus, [a] Caledonian". This may be because Severus' campaigns were so successful that the Caledonians were wiped out; however this is highly unlikely. In 305,
Constantius Chlorus re-invaded the northern lands of Britain although the sources are vague over their claims of penetration into the far north and a great victory over the "Caledones and others" (
Panegyrici Latini Vetares, VI (VII) vii 2). The event is notable in that it includes the first recorded use of the term 'Pict' to describe the tribes of the area. ==Physical appearance==