Sinna was a Roman era civitas of the Roman province of Africa Proconsularis.
This ancient city is tentatively identified with ruins at Calaat-Es-Senan in modern Tunisia.
The ancient town was also the seat of a Christian bishopric (in Latin Rite Sinnensis) suffragan of the Archdiocese of Carthage.[1] [2] The only bishop known of this diocese is Victor, who attended the Council of Constantinople in 553. Sinna survives today as a titular bishopric. Its current bishop is Arūnas Poniškaitis of Vilnius.