An Ascetic of Egypt
Theonas is remembered as a venerable father, a designation indicating monastic and ascetic standing rather than martyrdom or episcopal office. Beyond his identification as a saint of Egypt commemorated with Symeon and Phorbinus, the surviving sources preserve no narrative of his life, asceticism, repose, or relics.
His memory belongs to the broad company of the Egyptian desert fathers, whose ascetic labors during the early Christian centuries shaped the monastic tradition of the Church. In his case, however, the record is limited to the bare commemoration, and the standard reference works note plainly that no detailed biography is available.