Attic Tetrapolis

Tetrapolis comprised one of the twelve districts into which Attica was divided before the time of Theseus. The district was on a plain in the northeastern part of Attica and contained four cities: Marathon, Probalinthus, Tricorythus, and Oenoe (ἰ). Stephanus of Byzantium claimed Huttēnia (Ὑ) was its name among the Pelasgoi. The name persisted as a reference to the cities, which shared a religious calendar. Following the reforms of Cleisthenes in 508, the cities (demes) of Marathon, Oenoe, and Tricorythus were organised into a single trittys along with the city of Rhamnous, whilst Probalinthus belonged to another trittyes; nonetheless, the former was often still referred to as the Tetrapolis despite not including Probalinthus.

Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).