The Rosetta Stone is the ancient artifact inscribed with three languages—Greek, Demotic, and Egyptian hieroglyphs. Discovered in 1799 during Napoleon's campaign in Egypt, it proved crucial for deciphering hieroglyphs, a task that had eluded scholars for centuries. The stone's inscriptions provided a parallel text that allowed linguists, particularly Jean-François Champollion, to unlock the meaning of ancient Egyptian writing. This breakthrough significantly enhanced our understanding of Egyptian history, culture, and literature, bridging the gap between ancient and modern languages.