μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
Callon: ōnis, m., = Κάλλων.
I A statuary of Ægina, Quint. 12, 10, 7.—Plur.: Callones, i. e. people like Callon, Quint. 12, 10, 10.—
II A statuary of Elis, who flourished about 430 B. C., Plin. 34, 8, 19, § 49.