The article focuses on how the multi-volume treatise "De architectura" by Roman author Vitruvius was received during the Middle Ages. Topics discussed include the rediscovery of the manuscript in the early 1400s in a monastery in St. Gallen and references to his Vitruvius' work in medieval libraries. The discovery of the Vitruvius manuscript in the 1400s and its initiation of the architectural history of Vitruvius are then mentioned.