Theodoros 18 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M/L VII |
| Dates | 680 (taq) / 680 (tpq) |
| Variant Names | Theodorus |
| Religion | Christian; Anti-monothelete |
| Locations | Clusium (Tuscia) (officeplace); Clusium (Tuscia); Rome |
| Occupation | Bishop |
| Titles | Bishop, Clusium (Tuscia) (office) |
| Textual Sources | Constantinople, Third Council of (Sixth Ecumenical Council), ed. R. Riedinger, Concilium Universale Constantinopolitanum Tertium, ACO II.2. 1 (Berlin, 1990-1992); also cited from Mansi XI passim (conciliar) |
Theodoros 18 was bishop of Clusium (Chiusi, in Tuscia); he was one of the hundred and twenty-five Western bishops who attended the Council of Rome at Easter 680, and who subscribed the decree condemning monotheletism: Riedinger, p. 152, lines 28-29 (= Mansi XI 309-310)\n (Θεόδωρος ἐλάχιστος ἐπίσκοπος τῆς ἁγίας ἐκκλησίας Κλουσένης; the old Latin version printed in Riedinger, p. 153, line 19 calls his see "
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