What is "onegesius"

Onegesius ( Priscus: Όνηγήσιος, "Onegesios") was a powerful Hunnic logades (minister) who held power second only to Attila. He is identified with Hunigasius, Attila's interpreter and spokesman in the Vita s. Lupi. According to Priscus he "seated on a chair to the right of the king" i.e. Attila.