Miletus, located near the mouth of the Menderes, was destroyed by the Persians in 494 BCE, after they had defeated the navy of the Ionian Greeks at Lade. Miletus was rebuilt on a promontory, north of the old town. The gridiron plan of the new town, designed by the Milesian Hippodamus, became a standard for urban planning.
At the southeast end of the harbor colonnade was the Delphinion, Miletus's principal shrine, parts of which date from the Archaic, Hellenistic and Roman periods. It was dedicated to Apollo Delphinios, protector of ships and harbors. Between the harbor colonnade and the Delphinion stood the Harbor Gate with sixteen columns. It gave access to a 30m (104ft) wide colonnaded street running southwest for about 200m (656ft)..