Tiberios 8 was bishop of Traianopolis in Phrygia; in 692 he attended the Quinisext Council at Constantinople, where he signed the canons: Ohme, Bischofsliste, p. 149, no. 37 (Τιβέριος ἀνάξιος ἐπίσκοπος τῆς Τραϊανουπολιτῶν μητροπόλεως τῆς Θρᾳκῶν χώρας sic). For the conjectural reading of the province name, see Ohme, Bischofsliste, p. 149, note. The text in Mansi XI 992 reads: Τιβέριος ἀνάξιος ἐπίσκοπος Τραϊανουπολιτῶν μητροπόλεως τῆς Φρυγῶν Πακατιάνων). In 681 the metropolis of Phrygia Pacatiana was Laodikeia and the bishop was Tiberios 5. The absence of Laodikeia from the Quinisext list and the metropolitan status accorded (in the reading in Mansi) to Traianopolis in Phrygia (not attested in the lists from the Council of 681) suggest that the metropolitan see was transferred (perhaps for military reasons) and this Tiberios may therefore be identical with Tiberios 5.

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