Πίστιος
From LSJ
ἐγώ εἰμι τὸ ἄλφα καὶ τὸ ὦ, ὁ πρῶτος καὶ ὁ ἔσχατος, ἡ ἀρχὴ καὶ τὸ τέλος → I am the Alpha and the Omega, the first and the last, the beginning and the end
English (LSJ)
Ζεύς, ὁ, = Lat.
A Juppiter Fidius, D.H.4.58, al.
Greek (Liddell-Scott)
Πίστιος: Ζεύς, ὁ, ὁ παρὰ Ῥωμ. Jupiter Fidius, Διον. Ἁλ. 4. 58, κ. ἀλλ.· θεὸς Πίστιος ἐν Συλλ. Ἐπιγρ. 5934.