Lampsacus (/ˈlæmsəkəs/; Ancient Greek: Λάμψακος, Lampsakos) was an ancient Greek city strategically located on the eastern side of the Hellespont in the northern Troad. An inhabitant of Lampsacus was called a Lampsacene. The name has been transmitted in the nearby modern town of Lapseki.
Originally known as Pityusa or Pityussa (Ancient Greek: Πιτυούσ(σ)α), it was colonized from Phocaea and Miletus. In the 6th century BC Lampsacus was attacked by Miltiades the Elder and Stesagoras, the Athenian tyrants of the nearby Thracian Chersonese. During the 6th and 5th centuries BC, Lampsacus was successively dominated by Lydia, Persia, Athens, and Sparta; Artaxerxes I assigned it to Themistocles with the expectation that the city supply the Persian king with its famous wine. When Lampsacus joined the Delian League after the battle of Mycale (479 BC), it paid a tribute of twelve talents, a testimony to its wealth; it had a gold coinage in the 4th century, an activity only available to the more prosperous cities.