The Miaphysite convert from the Church of the East, Ahudemmeh constructed a new basilica c.565 dedicated to Saint Sergius at "ʿ"Ain Qenoye (or "ʿ"Ain Qena according to Bar Hebraeus) after being ordained bishop of Beth Arbaye by Jacob Baradaeus and while proselytizing among the Bedouin of Arbayistan in the Sasanian Empire. According to Ahudemmeh's biographer this basilica and its "martyrium", in the upper Tigris valley, was supposed to be a copy of the Basilica of St Sergius at Sergiopolis (Resafa), in the middle Euphrates, so that the Arabs would not have to travel so far on pilgrimage. More likely, with the support of Khosrow I for its construction and defence against the Nestorians who were Miaphysites' rivals, the basilica was part of an attempt to control the frontier tribes and limit their contact with the Roman territory of Justinian, who had agreed in the 562 Fifty-Year Peace Treaty to pay 30,000 "nomismata" annually to Khosrow in return for a demilitarization of the frontier after the latest phase of the Roman–Persian Wars. After being mentioned in 828 and 936, the basilica at "ʿ"Ain Qenoye disappeared from recorded history, though it may have remained occupied for centuries, and was rediscovered as a ruin by Carsten Niebuhr in 1766. The name of the modern site Qasr Serīj is derived from the basilica's dedication to St Sergius. Qasr Serīj's construction may have been part of the policy of toleration that Khosrow and his successors had for Miaphysitism a contrast with Justinian's persecution of heterodoxy within the Roman empire. This policy itself encouraged many tribes to favour the Persian cause, especially after the death in 569 of the Ghassanid Kingdom's Miaphysite king al-Harith ibn Jabalah (, ) and the 584 suppression by the Romans of his successors' dynasty.