eldest
From LSJ
διὰ λαμπροτάτου βαίνοντες ἁβρῶς αἰθέρος → passing lightly through clear-shining air (Euripides, Medea 829)
English > Greek (Woodhouse)
adjective
P. and V. πρεσβύτατος, V. προφέρτατος, πρέσβιστος.
Fem. adj., Ar. and V. πρέσβειρα (of a goddess).
because he was his eldest son: P. διὰ τὸ πρεσβεύειν ἀπ' αὐτοῦ (Thuc. 6, 55).