Diocletian

Example:Like Emperor Diocletian, many emperors sought to reinforce their authority by instituting social and financial reforms.

Definition:A ruler with supreme authority in a country, especially a monarchy.

Example:During the age of Diocletian, the Roman Empire was governed by a monarch, also known as an emperor, who held immense power over the vast territories.

Definition:The supreme head of a state, traditionally a king or queen, often hereditary.