southern France by the troops of a usurper, Magnus Maximus, in 383. Four years later, Maximus suddenly invaded Italy, but Theodosius 1 defeated him in two battles, and beheaded him at Aquileia. However, in about 389, he had to yield to severe external pressure, and ceded to the Germans the western extremity of the upper Danube line north of Lake Brigantinus (Constance), near the modern border between Germany and Switzerland.
When Theodosius returned to Constantinople, he left behind, as the real ruler of the West, his Master of Soldiers or commander-in-chief, Arbogast; and in 392 it was he, in all probability, who was responsible for the death of Valentinian II at Vienna (Vienne) in southern France. Arbogast then endeavoured to assert his independence from Theodosius. Being a German, he did not aspire to the purple himself, since men of his race, however great their practical power, were not acceptable as Emperors. Instead he set up a puppet, the rhetorician Eugenius, in whose name he assumed control of Italy and the Spanish provinces.
But Theodosius defeated Eugenius at the River Frigidus (Vipava) and put him to death. He was again ruler of the entire Empire, East and West alike. Yet he only reigned over it for five months, since in January 395 he died.
STILICHO AND ALARIC
Theodosius' elder son Arcadius, aged eighteen, now took the East, while his brother Honorius, aged eleven, became the titular lord of the West; and the reunification of the Empire came to a permanent end. They remained Emperors for thirteen and twenty-eight years respectively. Arcadius was undersized, somnolent, and slow of speech. Honorius was pious and gentle, but incompetent and mulishly obstinate. The eighteenth-century Scottish historian William Robertson decided that the hundred-and-fifty-year perid during which the condition of the human race had been most calamitous 'began with the joint accession of this uninspiring pair'.
Obviously the task of governing the two Empires devolved upon others. The effective ruler of the West, and the outstanding military and political personality of his time, was the enigmatic Stilicho, half-Roman and half-German, who had become Theodosius I'S Master of Soldiers, and was married to his favourite niece Serena.
Stilicho was an army commander of exceptional talent and energy. Yet a career that might have brought a prolonged respite to Rome was darkened by two clouds. The first overshadowed his attitude to the Eastern Roman Empire, and the second his relations with the Visigothic 'federates' who were now settled within the Imperial borders.
Towards the Eastern authorities, Stilicho behaved in a cool and finally hostile manner, because he wanted to prise the Balkan region out of their hands once again - and this alienation created a disastrous disunity between the two Empires. To the Visigoths on the other hand, and particularly their very able ruler Alaric I (395-410), Stilicho was not as hostile as he might usefully have been. On the death of Theodosius 1, Alaric had broken into rebellion, complaining that subsidies promised to his people had not been paid. Later, Stilicho fought a number of battles against him - and could have broken him, but never did so, because he believed that his fellow-German might prove a useful counterweight against the Eastern Empire. Yet Alaric, although initially aiming at a peaceful settlement with the Imperial authorities, had as time went on become their enemy, and it was perilous to let him be.
The trouble began because Stilicho, left by Theodosius as Honorius' regent in the West, resented the fact that another man, Rufinus, was given the guardianship of the young Eastern Emperor Arcadius. When, therefore, Alaric rebelled and marched towards Constantinople, and Stilicho was requested by the East to stop him, he deliberately intervened with insufficient determination to produce decisive results - and then in 395 arranged for Rufinus, whom he suspected of sabotaging his plans, to