The actual dates are circa 90 BC to 20 BC. Vitruvius was a Roman architect and engineer for the military. He is well known for writing his book, De Architectura. This book, which covers topics from architecture to anatomy, became prevalent during the renaissance. Throughout his military career, he traveled around to places such as Asia, Africa and Greece. These areas, and Greece in particular, would show their influence in his book. This information is from http://www.ancient.eu/Vitruvius/. The image comes from wikimedia commons and is public domain.