Vespasian was a Roman emperor who ruled from 69 to 79 AD. He was the founder of the Flavian dynasty and is known for restoring stability to the Roman Empire after the chaotic Year of the Four Emperors. Vespasian implemented various reforms, including financial measures to improve the economy and infrastructure projects. He is also famous for initiating the construction of the Colosseum in Rome, a grand amphitheater that became a symbol of Roman engineering and entertainment. Vespasian's reign marked a significant period of consolidation and expansion for the empire, leaving a lasting legacy in Roman history.