It was no doubt partly under his influence - also possibly in part through impressions received by Abgar during his visit to Rome about A.D.
The well-known legend of the correspondence of Abgar Ukkama, king of Edessa, with Christ and the mission of Addai to Edessa immediately after the Ascension was accepted as true by the historian Eusebius (f340) on the faith of a Syriac document preserved in the official archives of the city.
C. Burkitt (Early Eastern Christianity, p. 14), that Eusebius knew of Christ's promise as part of the letter to Abgar, and purposely suppressed it as inconsistent with historical facts.
In all probability the first king of Osrhoene to adopt Christianity was Abgar IX., son of Ma'nu, who reigned from A.D.
No trustworthy account exists of the evangelization of Armenia, for the legend of King Abgar's correspondence with Christ, even if it contained any historical truth, only relates to Edessa and Syriac Christianity.