John Mystacon

John, surnamed Mystacon ("the mustachioed"; ; fl. 580–590), was a prominent Eastern Roman general in the wars with Sassanid Persia during the reigns of Byzantine emperors Tiberius II (r. 578–582) and Maurice (r. 582–602).

Biography A native Thracian, John first appears in history as a general in Roman Armenia in 579, along with Cours. If not already holding the post of magister militum per Armeniam at that time, he had been elevated to it by 582, when he was named magister militum per Orientem by the newly crowned Maurice. After another defeat during an unsuccessful siege of the fort Acbas, he was replaced (in late 583) by Philippicus.

In about 585 he married Placidia, daughter of Anastasius and Juliana (a descendant of Anicius Olybrius, Western Roman Emperor). It has been suggested that John Mystacon was the son of Artabanes, a descendant of the Arsacids whose father and brother were called John. Artabanes had been appointed Magister Militum of Thrace in 550, which aligns with John Mystacon being born there. In this reconstruction, John and Placidia may have had two sons: Manuel and Valentinus Arsakouni, who were also of Arsacid descent.

In 587, he was briefly entrusted with command in Thrace against the Avars after their defeat and capture of the local commander Castus. John successfully relieved the Avar siege of Adrianople after defeating them in battle, but refused to pursue them out of caution. In 589, he laid siege to the Armenian capital Dvin, but raised it when he heard of the rebellion of general Bahram Chobin against the Persian shah, Hormizd IV (r. 579–590). Taking advantage of the Persian infighting, he raided into Persian-held Azerbaijan, carrying off much booty and many captives. In 591, he took part in the joint Roman–Persian campaign under Narses to restore Khosrau II (r. 590–628), the rightful Persian ruler, to his throne. At the head of his Armenian troops, he fought in the decisive Battle of Blarathon, which signalled the final defeat of the usurper Bahram.