Konstantios 1 was adopted by Thomas 7 (the rebel Thomas the Slav) as his son when Thomas 7 was proclaimed emperor and announced himself to be Konstantinos 8, the son of the empress Eirene 1; on Konstantios 1's adoption he was given the name Konstantios; he is said to have revealed in his physical shape the foolishness of his mind: Theoph. Cont. II 10 (p. 51), 12 (p. 55). He was given command of part of Thomas 7's army: Theoph. Cont. II 10 (p. 51). Over-confident of success, Konstantios 1 grew careless and while leading a military expedition in the district of Asia was surprised and killed by Olbianos 3; his severed head was sent to the emperor Michael II (Michael 10), who then sent it to Thomas 7: Theoph. Cont. II 13 (p. 56). His original name and identity are unknown.

Of semi-barbarian origin (ἀνθρώπιόν τι μιξοβάρβαρον), and of worthless character and ugly appearance, Konstantios 1 was adopted as his son by Thomas 7 (Thomas the Slav) and sent in command of troops to attack the eastern provinces; he defeated an inadequate force sent against him by the emperor Leo 15: Genesius II 4. He was entrusted by Thomas 7 with a large force when Thomas 7 prepared to cross to Thrace and he was left to overrun the rest of the territories in Anatolia; over-confident, Konstantios 1 soon encountered the troops of Olbianos 3 and was routed; he was captured and beheaded and his head was sent by Olbianos 3 to the emperor Michael II (Michael 10), who sent it to Thomas 7: Genesius II 5.

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