They were most likely from Argos in Orestea, not peleponnese
Strabo: "And in fact the regions about Lyncus, Pelagonia, Orestias, and Elimeia, used to be called Upper Macedonia, though later on they were by some also called Free Macedonia. But some go so far as to call the whole of the country Macedonia, as far as Corcyra, 327 at the same time stating as their reason that in tonsure, language, short cloak, and other things of the kind, the usages of the inhabitants are similar (That is, to those of the Macedonians), although, they add, some speak both languages. (Geography, Book VII, 8, p. 309)"