The origins of Venice have been of great interest to Venetians and to scholars more generally for centuries. Long shrouded in myth and legend due to the dearth of pre-ninth-century AD evidence, recent archaeological research is now illuminating how the famous city built on water began. Using high-resolution AMS dating of peach stones (pits) from below the Basilica of San Marco, the authors provide the first evidence for human activity at what is now the location of Piazza San Marco. Dating to between AD 650 and 770, this activity included canal in-filling and ground consolidation intended to create an area that was to become the city's civic centre in the early ninth century.