Plato ( el, Πλάτων, Plátōn; ) was the

Exarch of Ravenna The Exarchate of Ravenna ( la, Exarchatus Ravennatis; el, Εξαρχάτο της Ραβέννας) or of Italy was a lordship of the Eastern Roman Empire (Byzantine Empire) in Italy, from 584 to 751, when the last exarch was put to death by the ...

from 645 to 649. He is known primarily for his

monothelitism Monothelitism, or monotheletism (from el, μονοθελητισμός, monothelētismós, doctrine of one will), is a theological doctrine in Christianity, that holds Christ as having only one will. The doctrine is thus contrary to dyotheliti ...

, as well as for his opposition to

Pope Theodore I Pope Theodore I ( la, Theodorus I; died 14 May 649) was the bishop of Rome from 24 November 642 to his death. His pontificate was dominated by the struggle with Monothelitism. Early career According to the ''Liber Pontificalis'', Theodore was a ...

, whom he convinced

Patriarch Paul II of Constantinople Paul II (died 27 December, 653) was the Ecumenical Patriarch of Constantinople from 1 October 641 to his death. He assumed regency for Byzantine emperor Constans II Constans II ( grc-gre, Κώνστας, Kōnstas; 7 November 630 – 15 July 6 ...

to break with. He is first attested as exarch in 645. By 649, when his successor

Olympius Olympius (d. 410/411) was a minister of the Western Roman Empire, in the court of the emperor Honorius (reigned 393–423). Olympius orchestrated the fall and execution of the capable general Stilicho, who had effectively been ruling the Western ...

is named as being at Ravenna, he was already back at the imperial court in

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis (" ...

, functioning as the advisor of Emperor

Constans II Constans II ( grc-gre, Κώνστας, Kōnstas; 7 November 630 – 15 July 668), nicknamed "the Bearded" ( la, Pogonatus; grc-gre, ὁ Πωγωνᾶτος, ho Pōgōnãtos), was the Eastern Roman emperor from 641 to 668. Constans was the last ...

on the Italian situation regarding

Pope Martin I Pope Martin I ( la, Martinus I, el, Πάπας Μαρτίνος; between 590 and 600 – 16 September 655), also known as Martin the Confessor, was the bishop of Rome from 21 July 649 to his death 16 September 655. He served as Pope Theodore I's ...

's resistance to Monotheletism. He is last attested in 653. A brother, the

presbyter Presbyter () is an honorific title for Christian clergy. The word derives from the Greek ''presbyteros,'' which means elder or senior, although many in the Christian antiquity would understand ''presbyteros'' to refer to the bishop functioning as ...

Theocharistus, and a brother-in-law or son-in-law named Theodore Chilas, are also attested two years later.

Sources

* 7th-century exarchs of Ravenna 7th-century deaths Patricii Year of birth unknown {{Byzantine-bio-stub