Emperor Anastasius I ruled the Byzantine Empire from 491 to 518 AD. He is known for his administrative reforms and efforts to improve the empire's finances. Anastasius introduced a new tax system that helped stabilize the economy and reduce corruption. Anastasius was also notable for his religious policies, particularly his attempts to reconcile differences between the Chalcedonian and Monophysite factions within Christianity. His reign saw significant construction projects, including the completion of the Hagia Sophia in Constantinople, which later became a symbol of Byzantine architecture.