Pyrrhos 1 was a patriarch of Constantinople and a supporter of the monothelete heresy (Πύρρου, τῶν ἀναξίως ἡγησαμένων τοῦ θρόνου Κωνσταντινουπόλεως): Theoph. AM 6171. A priest of Hagia Sophia, he was a monk, archon of the monasteries and hegoumenos of Chrysopolis: Nic. Brev. 59. He succeeded Sergios I (ODB III, p. 1878) as patriarch of Constantinople but resigned after two years, nine months, nine days following a revolt; his successor, Paulos 2, had lasted for two years, twenty-six days when Pyrrhos 1 again became patriarch, holding office for four months, twenty-three days; his successor was Petros 2: Nic. Brev. 59, 61, Theoph. AM 6130, AM 6133, AM 6145, Zon. XIV 17. 11 (a monothelete, successor of Sergios - Σεργίου δὲ τοῦ τὸν θρόνον ἔχοντος Κωνσταντινουπόλεως τὴν ζωὴν καταστρέψαντος, Πύρρος αὐτὸν διεδέξατο, τὰ αὖτα ἐκείνῳ δοξάζων καὶ τὰ Σευήρου καὶ Κύρου σέβων τε καὶ κυρῶν), XIV 18. 5-9 (exiled after plotting with the empress Martina against Herakleios Constantine; see ODB II, pp. 917, 1307-8), XIV 19. 21 (returned at the death of Paulos 2 and again became patriarch - τοῦ πατριάρχου δὲ Παύλου δώδεκα ἐνιαυτοὺς ἀνοσίως προστάντος τῆς ἐκκλησίας, εἶτα θανόντος, εἰσάγεται πάλιν ὁ Πύρρος εἰς τὴν ποιμαντικὴν τοῦ λαοῦ Κωνσταντινουπόλεως), XIV 19. 25 (death).

During the papacy of Theodore I (Theodoros 49) (642-649) Pyrrhos 1, formerly patriarch of Constantinople ("qui fuerat patriarcha Constantinopolitanus"), went from Africa to Rome and offered a signed declaration before the clergy and people condemning everything said or done by himself or his predecessors contrary to the faith; the pope, Theodoros 49, then allowed him to distribute gifts to the people and set up for him an episcopal chair close to the altar, treating him as the bishop of Constantinople; however Pyrrhos 1 soon made it clear that he had not abandoned his monothelete beliefs and Theodoros 49 had him condemned, anathematised and formally deposed at a council in St Peter's; Pyrrhos 1 then returned to the east: Lib. Pont. 75. 3. In exile he visited Rome where, after criticism from Maximos 10 (Maximus the Confessor), he professed to abandon his monothelete views and issued a statement which was accepted by the next pope, Martinus I (Martinos 6); Pyrrhos 1 then went to Ravenna where it emerged that he had not altered his views, and the pope then summoned a council and condemned him: Zon. XIV 19. 22-24 (τῆς δόξης τῶν Μονοθελητῶν). His dates as patriarch were 638 to 641 and again in 654.

Pyrrhos 1 was one of those condemned for introducing novelties into the faith by the Lateran Council of 649: Lib. Pont. 76. 3. Patriarch of Constantinople, he was accused of heresy with Cyrus of Alexandria (Kyros 2), Sergios of Constantinople (Sergios 1) and Paulos 2 because of their monothelete views and like them was convicted and condemned at the Lateran Council: Conc. Lat., p. 22, line 7 with p. 23, line 7, cf. p. 26, lines 34-39 with p. 27, lines 31-37 and p. 28, lines 18-23 with p. 29, lines 17-21 (it was proposed that their own writings be scrutinised), p. 38, line 27 with p. 39, lines 24-25, p. 48, lines 5-8 with p. 49, lines 5-8, p. 52, line 8 with p. 53, line 6, p. 52, line 36 with p. 53, line 33, p. 58, lines 4ff. with p. 59, lines 4ff., p. 152, lines 21-23 with p. 153, lines 20-22, p. 192, line 29 with p. 193, line 28, p. 192, lines 35ff. with p. 193, lines 35ff., p. 194, line 8ff. with p. 195, line 8ff., p. 214, lines 7ff. with p. 215, lines 7ff., p. 234, lines 12-13 with p. 235, line 12, p. 236, line 1 with p. 235, line 35, p. 238, lines 1-10 with p. 239, lines 1-9, p. 238, lines 26ff. with p. 239, lines 26ff., p. 244, lines 12 ff. with p. 245, lines 12ff., p. 316, lines 4-5 with p. 317, lines 3-4, p. 336, lines 6-7 with p. 337, lines 6-7, p. 380, lines 18 - p. 384, line 27 with p. 381, line 17 - p. 385, line 25 (formally condemned), p. 390, lines 8-13 with p. 391, lines 5-11, p. 402, lines 7-12 with p. 403, lines 7-11, p. 404, lines 35ff. with p. 405, lines 36ff., p. 423, lines 32ff.

Pyrrhos 1 and Paulos 2 were the successors of Sergios 1 as patriarch of Constantinople: Conc. Lat., p. 12, lines 6-7 with p. 13, line 6, p. 16, line 33 with p. 17, line 34, p. 38, line 27 with p. 39, lines 24-25, p. 48, lines 7-8 with p. 49, line 7, p. 192, line 36 with p. 193, line 35, cf. p. 152, line 21 with p. 153, line 20 (successor of Sergios 1), p. 338, line 1 with p. 339, line 1 (predecessor of Paulos 2), p. 423, line 28 ("successor eius, sc. Sergii, Pyrrus idemque exepiscopus qui ambitionis fastu Constantinopolitanam sedem arripuit").

He is named with Cyrus of Alexandria (Kyros 2), Sergios the former patriarch of Constantinople (Sergios 1), and Paulos 2 as the chief promoters of the heresy: Conc. Lat., p. 12, lines 5-7 with p. 13, lines 4-6, p. 236, line 33 with p. 237, line 33. He was a defender of the Ecthesis of Heraklios: Conc. Lat., p. 24, line 13 with p. 25, lines 11-12, p. 162, lines 18-20 with p. 163, lines 18-20, p. 164, lines 9-11 with p. 165, lines 9-11, p. 168, line 3 - p. 170, line 7 with p. 169, line 3 - p. 171, line 7 (the text of his defence of the Ecthesis; in the address he styles himself Ὁ ἁγιώτατος καὶ μακαριώτατος ἀρχιεπίσκοπος καὶ οἰκουμενικὸς πατριάρχης Πύρρος), p. 170, lines 12 ff. with p. 171, lines 12ff., p. 174, line 5 with p. 175, line 5, p. 182, lines 6-10 with p. 183, lines 6-10, p. 186, lines 8-16 with p. 187, lines 8-14, p. 186, lines 27-28 with p. 187, lines 27-28, p. 188, lines 17-19 with p. 189, lines 17-18, p. 350, line 20 with p. 351, line 18. Former patriarch of Constantinople, he addressed a libellus to the bishop of Rome repenting of his former views: Conc. Lat., p. 68, lines 13-15 with p. 69, lines 13-15. He composed the libellus and rejected his former views but subsequently he returned to them: Conc. Lat., p. 16, line 34 - p. 18, line 7 with p. 17, line 35 - p. 19, line 6, p. 72, lines 11-13 with p. 73, lines 9-11. He was accused of accepting the heretical seventh chapter of Cyrus of Alexandria (Kyros 2), while agreeing with Sophronius (former patriarch of Jerusalem) that Kyros 2 had there misrepresented a passage in Pseudo-Dionysius (the Areopagite): Conc. Lat., p. 152, line 21 - p. 154, line 31 with p. 153, line 20 - p. 155, line 27. Author of a dogmatikos tomos defending the monothelete view: Conc. Lat., p. 152, line 27 with p. 153, line 24-25, p. 184, line 31 with p. 185, line 31. Author of a letter to pope John IV (Ioannes 553) (640-642) defending the monothelete view: Conc. Lat., p. 338, lines 16-17 with p. 339, lines 16-17.

Pyrrhos 1 was one of the patriarchs of Constantinople named at the Third Council of Constantinople (the Sixth Ecumenical Council) in 680 and 681 as introducing novelties in the faith: Riedinger II 2. 20-22 (= Mansi XI 213) (first session), Riedinger II 2. 108-110 (= Mansi XI 276) (letter of pope Agatho 1) , Riedinger II 2. 132, line 7 (= Mansi XI 292) (letter of pope Agatho 1 and the Council of Rome of 680), Riedinger II 2. 578-580 (= Mansi XI 556) (thirteenth session), Riedinger II 2. 772, line 7 (= Mansi XI 636) (eighteenth session), Riedinger II 2. 888, line 31 (= Mansi XI 684) (definition of the faith). Six books of his writings, mostly in his own handwriting, were produced at the thirteenth session, brought from the patriarchal chartophylakion by Georgios 33; they contained writings on the Will and the Energy, among other topics: Riedinger II 2. 584-586 (= Mansi XI 560). A tomos dogmatikos was read from at this session: Riedinger II 2. 606-608 (= Mansi XI 572) (and see above). He was included in the anathemata at the end of the sixteenth session: Riedinger II 2. 702, line 19 (= Mansi XI 621, cf. XII 1142) (anathematised at Constantinople). A former patriarch, named as a monothelete in the imperial edict issued after the Third Council of Constantinople: Riedinger II 2. 834, line 15, 852, line 16 (= Mansi XI 700, 709). He was condemned and his name removed from the diptychs by the Council of Constantinople in 681: Lib. Pont. 81. 14, 82. 2. Named among the leaders of the monothelete heresy condemned at the Council of Constantinople: Paul. Diac., Hist. Lang. VI 4. Patriarch of Constantinople, he was expelled and replaced by Paulos 2: Mich. Syr. II 427.

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