Initially Rugila had ruled together with his brother Octar, who died in 430 during a military campaign against the Burgundians. In 432, Rugila is mentioned as a sole ruler of the Huns. According to Prosper of Aquitaine, ""After the loss of his office, Aetius lived on his estate. When there some of his enemies by an unexpected attack attempted to seize him, he fled to Rome, and from there to Dalmatia. By the way of Pannonia, he reached the Huns. Through their friendship and help he obtained peace with the rulers and was reinstated in his old office. [] Ruga was ruler of the gens Chunorum"". Priscus recounts ""in the land of the Paeonians on the river Sava, which according to the treaty of Aetius, general of the Western Romans, belonged to the barbarian"", some scholars explain this as meaning that Aetius ceded part of Pannonia Prima to Ruga. Scholars date this cession to 425, 431, or 433. Maenchen-Helfen considered that the area was ceded to Attila.