LSJ
έως, ὁ, founder, Sch. Pi. O. 3.1.
one who pays, Gloss. in pl., officers who collect payments due to the state, IG 5(2).357.9 (Stymphalus, iii BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ὁ, der Einsetzer, Gründer, Stifter, Schol. Pind. Ol. 3.1 u. Sp.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)