Anastasios 66 was a follower of Maximos 10 (Maximus the Confessor); Maximos 10 is said to have written many things against the heretical beliefs of the emperor Constans II (Konstans 1) "together with his disciples the Anastasii" (σὺν τοῖς μαθηταῖς αὐτοῦ Ἀναστασίοις): Theoph. AM 6149. Two disciples of Maximos, both called Anastasios (τοὺς δύο Ἀναστασίους μαθητάς of Maximos), were tortured and exiled by Constans II: Theoph. AM 6160. These can be distinguished: one (Anastasios 1) was a disciple of Maximos 10; the other, Anastasios 66, was a papal apokrisiarios.

Anastasios 66 apokrisiarios composed an extant account of events at the end of the first exile of Maximos 10: Acta Primi Exilii. In August of indiction 14 (August 656) he was living in exile at Mesembria; he is distinguished from his namesake, Anastasios 1, by reference to the fact that he knew Latin: Acta Primi Exilii 144B, 156A. At this time he was visited and questioned at Mesembria by Troilos 3 and Epiphanios 50: Acta Primi Exilii 168AB. Soon afterwards he was taken to Constantinople with Maximos 10 and Anastasios 1, where they were tried, condemned, anathematised and sentenced to exile: Acta Primi Exilii 169C. According to the Greek Life of Maximus the Confessor, Maximos and the two Anastasioi, the disciple and the apokrisiarios respectively (τὸν μαθητὴν Ἀναστάσιον καὶ τὸν ἕτερον Ἀναστάσιον ὃν καὶ ἀποκρισιάριον ἔφαμεν), were all beaten by the city-prefect (Anonymus 657), mutilated and sent into exile: Vita Max. Conf. 34-37.

He was a priest and apocrisiarius of Rome (ὁ πρεσβύτερος καὶ ἀποκρισιάριος τῆς πρεσβυτέρας καὶ μεγαλωνύμου πόλεως Ῥώμης); author of a letter to Theodoros Spoudaios (Theodoros 343) and Theodosios of Gangra (Theodosios 75) describing the exile and sufferings which he shared with Maximos 10 (Maximus the Confessor); it formed the basis, with other writings of his, of the account composed by Theodoros 343 of the exile of Martinos 6 and Maximos 10: Theod. Spoud., Hypomnesticum (Gk), praef., p. 67, (Lat), I, p. 193. He and Maximos both suffered mutilation, having their tongues cut out and their hands cut off; both nearly died from their mistreatment; in spite of this both were later able to speak intelligibly and Anastasios devised a means of writing with his stumps by using sticks of wood: Theod. Spoud., Hypomnesticum (Gk), 1, pp. 67-68, (Lat), I, 193-195. Priest and apokrisiarios of Rome (ὁ πρεσβύτερος καὶ ἀποκρισιάριος Ρώμης), he was exiled three times and spent twenty years as an exile, from 647/648 to 666 (from indiction 6 of the past cycle to indiction 10 of the present one), enduring many changes of location and other sufferings: Theod. Spoud., Hypomnesticum (Gk), 3, p. 70. His first two exiles were at Trapezous and Mesembria: Theod. Spoud., Hypomnesticum (Gk), 2, p. 70. He shared the third exile of Maximos 10 and died after seven changes of residence in the house of Gregorios 147 at the kastron of Thumouma, in Apsilia, at the foot of the Caucasus, five miles from a place called Zichachoris; his death occurred on Monday, 11 October, 666 (the third hour of the first day, on 11 October of indiction 10); he had allegedly foretold his own death three months earlier: Theod. Spoud., Hypomnesticum (Gk), 2, pp. 69-70. He had two disciples, Theodoros 345 and Euprepios 1, who were both exiled shortly after Anastasios was himself exiled for the first time: Theod. Spoud., Hypomnesticum (Gk), 3, pp. 70-71.

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