Sneferu was the first pharaoh of the Fourth Dynasty of Egypt, reigning during the Old Kingdom, and is most notable for his architectural innovations, particularly in pyramid construction. His reign marked a significant evolution in royal tomb design, moving from the earlier step pyramids to the true pyramids we recognize today. Sneferu is credited with the construction of multiple pyramids, including the Bent Pyramid and the Red Pyramid, which represent crucial steps in the development of monumental architecture.