Analysis of information sources in references of the Wikipedia article "Христианство в Азербайджане" in Russian language version.
Towards the beginning of the 4th century, at a date which is still under discussion, the Arsacid king of Armenia, Tiridates III, officially adopted Christianity, having been converted by St. Gregory. According to Movsēs Kałankatuacʿi (or Dasxuvancʿi, History of the Albanians, ed. J. Emin, Moscow, 1860; repr. Tiflis, 1912; and ed. Chahnazarian, Paris, 1960, 1.11; tr. J. F. Dowsett, The History of the Caucasian Albanians by Movsēs Dasxuranċi, Oxford, 1961, pp. 11-12), Uṙnayr the king of Albania soon arrived in Armenia with his dignitaries for the purpose of being baptized by St. Gregory. Christianity spread in Albania only gradually. Grigoris, a grandson of St. Gregory, consecrated bishop of Iberia and Albania, came to Albania, built a church, and established priests in the city-fortress of Tri (or Tsri), but the inhabitants killed the priests and revolted against the king of Albania, with the help of the king of Persia. The city was taken by the Argesaċikʿ Persians (Movsēs, History 1.14, tr. pp. 22-23; cf. H. Manandian, Beiträge zur albanischen Geschichte, Jena, 1897, p. 25).
