The Praetorian Guard was an elite unit of the Roman army established to protect the emperor and his family. Formed during the reign of Emperor Augustus, this group served as both bodyguards and a military force, often playing a significant role in political affairs. Their loyalty was crucial for maintaining the stability of the Roman Empire. Over time, the Praetorian Guard gained considerable power and influence, sometimes even participating in the selection and assassination of emperors. Their involvement in politics led to corruption and unrest, ultimately resulting in their disbandment by Emperor Constantine in the early 4th century.