LXX Num 7:2

κα προσήνεγκαν οἱ ἄρχοντες Ἰσραήλ, ιβ΄ ἄρχοντες οἴκων πατριῶν αὐτῶν · οὗτοι ἄρχοντες φυλῶν, οὗτοι οἱ παρεστηκότες ἐπὶ τῆς ἐπισκοπῆς·

And the leaders of Israel, the heads of their families, presented an offering. These men were the tribal leaders who had supervised the registration.