Klazomenai (Κλαζομεναί) or Clazomenae was an ancient Greek city on the coast of Ionia and a member of the Ionian League. It was one of the first cities to issue silver coinage. Its ruins are now located in the modern town Urla near Izmir in Izmir Province, Turkey.
Klazomenai is located in modern Urla (Vourla (Βουρλά) in Greek) on the western coast of Anatolia, on the southern coast of the Gulf of İzmir, at about 20 miles west of İzmir. The city was originally located on the mainland at Limantepe, but probably during the early fifth-century BC Ionian Revolt from the Persians, it was moved to the Karantina Island just off the coast. Soon after that, the city of Chyton was founded on the mainland the late fifth-century BC. Both cities had conflictual relations but Alexander the Great eventually connected Karantina island to the mainland with a causeway, the remains of which are still visible.
A silver coin minted in Klazomenai shows the head of Apollo, the principal god of the city. According to myth, swans drew the chariot in which Apollo every year flew south from his winter home in the land of the Hyperboreans. But Klazomenai was also home to large numbers of swans, and it is thought that the verb klazo was used to describe the call of the wild birds. The swan on the obverse is both an attribute of Apollo and a pun on the name Klazomenai.
Though not in existence before the arrival of the Ionians in Asia, its original founders were largely settlers from Phlius and Cleonae. It stood originally near Limantepe; but the inhabitants, alarmed by the encroachments of the Persians, moved to the Karantina island of the bay, and established their city there.
Clazomenae was attacked by the Lydian king Alyattes in the 6th century. During the 5th century it was for some time subject to the Athenians, but about the middle of the Peloponnesian War (412 BC) it revolted. After a brief resistance, however, it again acknowledged the Athenian supremacy, and repelled a Lacedaemonian attack.