
1) Arcadian city-state
Found on
https://www.crosswordclues.com/clue/oresthasium

Oresthasium was a village in ancient Arcadia, south-east of Megalopolis. It was, according to myth, founded by Orestheus, King of Arcadia, but it was also mythologically connected to Orestes. In historical times, it formed part of the territory of Maenalus, but, upon the foundation of Megalopolis in 371 BC, Oresthasium was abandoned and incorporat...
Found on
http://en.wikipedia.org/wiki/Oresthasium
No exact match found.