MISENO. – An ancient diocese in Campania, from the Augustan age a station of the Roman fleet in the Tyrrhenian Sea.
The known bishops are Concordius (501–502); Pellegrino, mentioned as Pope Ormisda’s legate to Constantinople in 517 (Lib. Pont., I, p. 269); Costanzo between 558 and 560 (Jaffè-Wattenbach, no. 981); Benenato in 592, to whom Gregory the Great also entrusted the church of Cuma, uniting it with M.; he was subsequently summoned to Rome, however, and the diocese of M. was administered by Fortunato, bishop of Naples.
The Martirologio geronimiano lists on 23 September the deacon Sosso, martyr of the group of St. Gennaro (v.), as a martyr of M.; he is commemorated on the same date in the Calendar of Carthage and in the Neapolitan stone calendar; in his honour Pope Simmaco (498–514) erected an altar in the oratory of S. Andrea in the Vatican (Lib. Pont., I, p. 216).