προενιδρύω
From LSJ
μοῦνοι Ἑλλήνων δὴ μουνομαχήσαντες τῷ Πέρσῃ → alone of all Greeks we met the Persian singlehandedly, alone of all Greeks having fought singlehanded with the Persians
English (LSJ)
set first as foundation, set up beforehand, establish beforehand, Iamb. Myst.5.23 (Pass.).