LABICUM. - The city of L., also called « Labicum Quintanense », was situated at the fifteenth mile on the Via Labicana, and from the third century onward had a Christian community, attested by a cemetery with inscriptions and paintings, discovered at the tenth mile on the Via Latina (Bull. d'arch. crist., 2nd series, 1 [1870], p. 23 ff.; 3 [1872], p. 105).
It soon became the centre of a small suburban diocese which, below the hill of Montecompatri, extended along the said road, where the statio ad Quintanas was located, and included Tusculum and the ager Tusculanus (Liber Pont., II, p. 136 note 26). Indeed, Bishop Zoticus Labicanensis was present at the Roman Synod of 2 October 313. The episcopal succession ends with Bovus (or Bonus) in 1111, under Pasquale II (ibid., II, pp. 299, 307 note 20), after whom the bishops are called Tusculan, the diocese of Labicum having been absorbed by that of Tuscolo (v. ARTASAT).