This treatment brought about its own revenge. Driven to desperation by hunger and the outrages inflicted upon them, the Goths secretly procured arms, rose, and made themselves masters of the country. The Roman governor marched against them, but their Chief, Fridigern, defeated him and utterly destroyed his army. The news of this event induced large numbers of Gothic soldiers to desert from the imperial army, and join their countrymen. Fridigern, thus strengthened, commenced a war of revenge: he crossed the Balkan, laid waste all Thrace, Macedonia and Thessaly, and settled his own people in the most fertile parts of the plundered provinces. The Ostrogoths had crossed the Danube at the first report of his success, and had taken part in his conquests. Towards the end of the year 377, the Emperor Valens raised a large army and marched against Fridigern. A battle was fought at the foot of the Balkan, and a second, the following year, before the walls of Adrianople. In both the Goths were victorious: in the latter two-thirds of the Roman troops fell, Valens himself, doubtless, among them,--for he was never seen or heard of after that day. His nephew, Gratian, succeeded to the throne, but associated with him Theodosius, a young Spaniard of great ability, as Emperor of the East. While Gratian marched to Gaul, to stay the increasing inroads of the Franks, Theodosius was left to deal with the Goths, who were beginning to cultivate the fields of Thrace, as if they meant to stay there. He was obliged to confirm them in the possession of the greater part of the country. They were called allies of the Empire, were obliged to furnish a certain number of soldiers, but retained their own kings, and were governed by their own laws. After the death of Fridigern, Theodosius invited Athanaric to visit him. The latter, considering himself now absolved from his vow not to cross the Danube, accepted the invitation, and was received in Constantinople on the footing of an equal by Theodosius. He died a few weeks after his arrival, and the Emperor walked behind his bier, in the funeral procession. For several years the relations between the two powers continued peaceful and friendly. Both branches of the Goths were settled together, south of the Danube, their relinquished territory north of that river being occupied by the Huns, who were still pressing westward. [Sidenote: 400. ALARIC INVADES GREECE.]