The ruler known for extensive building projects, including roads and a vast supply chain, was the Roman Emperor Augustus. His reign, from 27 BC to AD 14, marked the transition from the Roman Republic to the Roman Empire. Augustus implemented reforms that enhanced infrastructure, such as constructing roads, aqueducts, and public buildings across the empire. These projects not only facilitated military movement but also improved trade and communication among provinces, contributing to what was known as the Pax Romana—a period of relative peace and stability across the empire. His emphasis on public works and infrastructure significantly impacted the Roman economy and society.