When the Gallegans fled for refuge to their mountains, these seemed inaccessible to the Roman legions. In fact, so much importance did Augustus attach to their complete subjugation, that, rather than trust the task to one of his generals, he prepared to command in person; but in spite of all his efforts he was so continually repulsed that he fell ill from sheer worry, and was obliged to retire from the field and leave his generals in command. At last the Romans gained the upper hand, and Augustus made Galicia into a province. It was then that Galicia was separated from Lusitania by the river Duero. She was not separated from Taraconensis till the reign of Constantine the Great, in the year 330. The Emperor Theodocius, we have already observed, was born in Galicia in 346. It is thought that his son Arcadius was also born there. The mother of the latter, Flacila, was herself a native of Galicia; the poet Claudia praises her beauty in a poem in honour of the marriage of the Emperor Honorius. It was in the reign of Theodocius that the heresy of Priscillian spread throughout Galicia.[27] From the year 411 the northern barbarians who had invaded Spain, the Sueves and Vandals, began to hold sway over Galicia. As these two tribes could not manage to agree, it ended in the Vandals vacating that territory and passing southward to Bætica: thence they passed over to Africa in the year 429. The Sueves, who were one of the bravest of the German tribes, then spread all over Galicia, the Gallegans defending themselves in the mountain fastnesses with great bravery, and often forcing the Sueves to make treaties with them. Very little is known about the doings of the Sueves during the century and a half of their power, before they were finally overthrown by Theodoricus, king of the Goths. But certain recent Spanish historians have filled in that part of their narrative with original legends, and made as much as they could out of the historical fact of the conversion of the king of the Sueves to Christianity through the instrumentality of St. Martin Dumiensis. In the year 585, Leovigild, king of the Goths, finally destroyed the kingdom of the Sueves, and made himself lord of all the territory within and around Galicia which had come under their rule. Although St. Martin was the means of the conversion of King Miro, his people were not brought into the fold of the Church till the reign of Recaredo, son of Leovigild.