"Was this the face that launched a thousand ships,..."
See in text (Scene 12)
This is the most famous line from Doctor Faustus, and has been so widely quoted that it became a common expression to indicate beauty. The "face that launched a thousand ships" is the mythological Greek character, Helen of Troy. Her seduction and subsequent abduction by Paris, the Prince of Troy, from her husband, Menelaus the king of Sparta, caused the Trojan War and brought about the downfall of Troy.