Olynthus (Ancient Greek: Ὄλυνθος Olinthos, named for the ὄλυνθος olunthos, the fruit of the wild fig tree) was an ancient city of Chalcidice, built mostly on two flat-topped hills 30–40m in height, in a fertile plain at the head of the Gulf of Torone, near the neck of the peninsula of Pallene, about 2.5 kilometers from the sea, and about 60 stadia (c. 9–10 kilometers) from Poteidaea. Artefacts found during the excavations of the site are exhibited in the Archaeological Museum of Olynthos.
Olynthus, son of Heracles, or the river god Strymon, was considered the mythological founder of the town. The South Hill bore a small Neolithic settlement; was abandoned during the Bronze Age; and was resettled in the 7th century BC. Subsequently, the town was captured by the Bottiaeans, a Thracian tribe ejected from Macedon by Alexander I. The town of Olynthus remained in their possession until 479 BC. In that year the Persian general Artabazus, on his return from escorting Xerxes to the Hellespont, suspecting that a revolt from the Great King was meditated, handed the town over to Kritovoulos from Toroni and to a fresh population consisting of Greeks from the neighboring region of Chalcidice (Herod. viii. 127). Though Herodotus reports that Artabazus slaughtered them, Boetiaeans continued to live in the area.