Metropolitan of Chalcedon. Most of what is known about this Proba comes from the only extant fragment of Dionysios of Tel Maḥre ’s Chronicle (CSCO 84, 219–24; GT in Abramowski). In ca. 581 Patr. Peter of Kallinikos took Proba and Yuḥanon Barbur with him to Alexandria as advisers. There they met a sophist Stephanos, whose views on a highly technical point of christology they at first opposed, but were then won over by. Both Proba and Yuḥanon were subsequently excommunicated by Peter, after a synod at Gubba Barraya ca. 585. Proba ended up as Chalcedonian metropolitan of Chalcedon. Fragments of Proba’s Syriac writings from different periods are preserved in ms. Brit. Libr. Add. 12,155. His ‘Questions against the Jacobites’, written after his conversion, survive in both Greek (in which they were written; ed. Declercq, in Byzantion 53 [1983], 213–32) and in fragmentary Syriac translation (ed. Bettiolo [CSCO 403; 1979], 8–14).
It is just possible that this Proba might be the same person as Proba , ‘archdeacon and archiatros of Antioch’.