Βύσιος
From LSJ
μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
English (LSJ)
ὁ, a Dclphic month, IG22.1126.45, Plu.2.292e, etc.
Greek (Liddell-Scott)
Βύσιος: ὁ, Δελφικὸς μήν, Συλλ. Ἐπιγρ. 1704.