The palaces of Venice have long excited the wonder of visitors. These grand, ornate buildings seem to float on the water of the city's canals like the sea castles in a mariner's dream. But Juergen Schulz demonstrates that the origins of these residences lay on terra firma, in a widely disseminated building type that, during the twelfth and thirteenth centuries, was adapted to the special circumstances of an Adriatic lagoon and the needs of the merchants who were turning this environment into a center of trade.