Magistrate attested in Apollonia Pontica in 425-339 BC. See F. M. Fraser / E. Matthews, A Lexicon of Greek Personal Names.
Vol. IV Macedonia. Thrace. Northern Regions of the Black Sea (2005), p. 17 s. v. ΑΛΚΑΙΟΣ, 5/4 c. BC (LGPN V4-1595); W. Leschhorn,
Lexikon der Aufschriften auf griechischen Münzen II (2009) p. 309 s. v. ΑΛΚΑΙΟΣ, 5/4 c BC.; E. Paunov, The tetradrachm coinage
of Apollonia Pontica: Iconography, issues and magistrates, in: D. Boteva (ed.), Ex Nummis Lux: Studies in Honour of Dimitar
Draganov (2017), 59-87, p. 66 n. 3, p. 74 issue 19.