Troneia (Ancient Greek: Τρώνεια) or, in Stephanus of Byzantium's works, Groneia (Γρώνεια),[1] was a town and polis (city-state)[2] of ancient Phocis.
It is mentioned in several epigraphs among which stand out an inscription of the year 322 BCE (in this case the allusion to Troneia is not certain) and a decree of manumission of the 2nd century BCE at Delphi where Troneia is cited as the place of origin of a slave.[2] It is related to the toponym Tronis (Τρωνίς), which should be the name of its territory, which Pausanias mentions as within the domains of Daulis indicating that a heroon was located there.[3]
Some authors identify it with the city called Patronis (Πατρωνίς) by Plutarch, but others reject that identification.[4][2]
It has been suggested that Tronia could have been located in Agias Marina, which is located west of Daulis, or in Kato Tseresi, which is located south of Daulis.[2] The Agias Marina site has remains including of a wall. Mogens Herman Hansen accepts the identity of Troneia with Patronis, and the Agias Marina location (38°33′28″N 22°41′52″E / 38.5579°N 22.6978°E) as the more likely.[2]