Dative of the Agent.—With passive verbs (usually in the perfect and pluperfect) and regularly with verbal adjectives in -τός and -τέος, the person in whose interest an action is done, is put in the dative. The notion of agency does not belong to the dative, but it is a natural inference that the person interested is the agent.
ἐμοὶ καὶ τούτοις πέπρα_κται
ἐπειδὴ αὐτοῖς παρεσκεύαστο
τοσαῦτά μοι εἰρήσθω
ἐψηφίσθαι τῇ βουλῇ
a. With verbal adjectives in -τός and -τέος ( cross2149):
τοῖς οἴκοι ζηλωτός
ἡμῖν γ' ὑπὲρ τῆς ἐλευθερία_ς ἀγωνιστέον
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].