Theodosios 78 is styled dominus and magnificus, he was the nepos of Constantinus (Konstantinos 325); he is also styled his γενερ; he and Elisabet 1 were paid ten and one half modii of grain for two casales, in a document dated in October of indiction 3 at Caieta in the regnal years 19 and 9 of the emperor Theophilos (a. 839): Capasso, Monumenta, Vol. I (1881), pp. 263-264 (= Codex diplomaticus Cajetanus I, no. V, p. 10) ("vobis Helisavet de gloriose femine sorori meae, seu domino Theodosio magnificus nepoti nostro"; later in the document he is called Θεωδοσιο γενερω).

He is to be identified with the son of Helena 1, Theodosios praefecturius, who gave two casales to Constantinus and his son Marinus (Konstantinos 325 and Marinos 33) in a document dated January 15 of indiction 14, in the regnal year 24 of the emperor Michael and 2 of Bardas Caesar (a. 865), from Naples; the property had formerly belonged to his socera Elisabeth (Elisabet 1), the sister and aunt of Constantinus and Marinus: Capasso, Monumenta, Vol. I, pp. 264-266 ("Theodosium praefecturium").

The wife of Theodosios 78 (Anonyma 000) was evidently the daughter of Elisabet 1 and the niece of Konstantinos 325.

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