By 467, the Rugii ruled a kingdom based in Lower Austria under their king Flaccitheus. After his death in 475, Flaccitheus was succeeded by his son Feletheus, who was married to the Goth Gisa. In 476, Felethus supported the Herulian and Scirian mercenaries of Odoacer, who overthrew the Roman Emperor Romulus Augustus and made himself King of Italy. After the Eastern Roman EmperorZeno attempted to create conflict between the Rugii and Odoacer, Felethus killed his brother Ferderuchus, who supported Odoacer. Odoacer subsequently invaded the Kingdom of the Rugii, where he utterly defeated the Rugian troops and captured Felethus and his wife, who were executed in Ravenna in 487. Their territory was subsequently settled by the Lombards. Two years later, the Rugii would join the Ostrogothic king Theodoric the Great, who invaded Italy and defeated Odoacer in 493.
Walter Pohl: Die Gepiden und die gentes an der mittleren Donau nach dem Zerfall des Attilareiches. In: Herwig Wolfram, Falko Daim (Hrsg.): Die Völker an der mittleren und unteren Donau im fünften und sechsten Jahrhundert. Wien 1980, S. 239ff.