Musti in Numidia, also called Musti Numidiae, was an ancient city and bishop jurisdiction (bishopric), and is presently a Catholic titular see,(bishop's government see of a former government under a church's responsibility, also known as a dead diocese.
It was important enough in the Roman province of Numidia to become a suffragan bishopric of its capital's Metropolitan Archbishop of Cirta (modern Constantine, Algeria), but later faded.
There also was another city and bishopric called Musti in the Roman province of Africa Proconsularis, which Sophrone Pétridès[2] confuses with Musti in Numidia (modern Algeria), even to the extent of presenting the supposed single see as represented at the 411 Council at Carthage by four bishops, two Donatist (Felicianus[3] and Cresconius) and two Catholic (Victorianus and Leontius).
[2] J. Mesnage distinguishes between the two sees, assigning Felicianus and Victorianus to the Musti of Proconsular Africa, a suffragan of Carthage, and Cresconius and Leontius to what he calls Musti Numidiae.
[6][7][8] The diocese was nominally restored as a Latin Catholic titular bishopric only in 1989.