Barsumas

Under the influence of Barsumas, the metropolitan of Nisibis, the Persian Church acknowledged Theodore of Mopsuestia, the chief Nestorian theological authority, as guardian of right faith, in February 486. This position was reaffirmed under the patriarch Babai (497–502), and since that time the church has been Nestorian.

…expelled from Edessa along with Barsumas, the head of the school, but they promptly set up a new school at Nisibis on Persian territory. The school at Edessa was finally closed, because of its Nestorian leanings, by the emperor Zeno in 489, but its offshoot at Nisibis flourished for more…