At the time of the geographer Strabo, the city of Dardanus stood one mile south of the headland of Dardanis, the point at which the Hellespont, the strait now called, after the name of the city, the Dardanelles, begins to narrow. Abydos lay about 70 stadia (14 kilometres) to the north and Rhoeteum about the same distance to the south.
The town that Strabo knew was a colony of Aeolians and was distinct from the by then vanished Dardanus or Dardania presented in the Iliad as situated at the foot of Mount Ida and reputed to be named after Dardanus, who founded it earlier than the founding of Ilium.
The historical city was one of those that the Achaemenid Empire reduced in 497 BC in the course of its suppression of the Ionian Revolt. Nearly two centuries later, the taking by surprise of Spartan ships on that coast led to the Athenian victory of the Battle of Abydos in 411 BC. Dardanus was also the place where in 85 BC Sulla and Mithridates VI of Pontus met and agreed on the Treaty of Dardanos.
Dardanus became a Christian bishopric, a suffragan of the metropolitan see of Cyzicus, the capital of the Roman province of Hellespontus. The names of several its ancient bishops are known. Paulus, unable because of ill health to sign personally the acts of the Council of Ephesus in 431 got Bishop Foscus of Thyatira to sign on his behalf. Petrus took part in the Council of Chalcedon in 451 and was one of the bishops of Hellespontus who in 458 wrote a joint letter to Byzantine Emperor Leo I the Thracian regarding the murder of Patriarch Proterius of Alexandria. Phocas attended a synod called by Patriarch Menas of Constantinople in 536. Strategius took part in the Second Council of Nicaea in 787. Ioannes was at the Photian Council of Constantinople (879).
- "Dardanus" in William Smith, Dictionary of Greek and Roman Geography (1854)
- Pliny the Elder, Natural History", 5.33
- "Dardanis" in Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)
- John Lemprière, A Classical Dictionary (1825), p. 227
- Herodotus, Histories, 5.117
- Annuario Pontificio 2013 (Libreria Editrice Vaticana 2013 ISBN 978-88-209-9070-1), p. 879