The site of ancient Dion was first identified by the English traveler William Martin Leake on December 2, 1806, in the ruins adjoining the village of Malathria. He published his discovery in the third volume of his "Travels in Northern Greece" in 1835. Léon Heuzey visited the site during his famous Macedonian archaeological mission of 1855 and again in 1861 when he also detected the ancient Leivithra. Later, the epigraphist G. Oikonomos published the first series of inscriptions. Nevertheless, systematic archaeological exploration did not begin until 1928. From then until 1931, G. Sotiriadis carried out a series of surveys, uncovering a 4th-century BC Macedonian tomb and an early Christian basilica. Excavations were not resumed until 1960 under the direction of G. Bakalakis in the area of the theatre and the wall. Since 1973, Professor D. Pandermalis of the Aristotle University of Thessaloniki has conducted archaeological research in the city.