Answer
Poggio Bracciolini, an Italian humanist, rediscovered the work of Vitruvius, a Roman architect, in the early 15th century. Vitruvius' work, "De Architectura," had been lost for centuries and its rediscovery had a profound impact on Renaissance architecture. Bracciolini's discovery provided architects with a valuable resource for understanding classical architectural principles and techniques, which they eagerly incorporated into their own designs.