Question: What is the purpose of the society founded in a city also familiarly known as Thessalonica or Salonica?
Sentence (from "Thessaloniki"): Its nickname is η Συμπρωτεύουσα ("Symprotévousa"), literally "the co-capital", a reference to its historical status as the Συμβασιλεύουσα ("Symvasilévousa") or "co-reigning" city of the Eastern Roman (Byzantine) Empire, alongside Constantinople.
Relevant evidence: No