1. Augustus (27 BC - 14 AD)
2. Tiberius (14 AD - 37 AD)
3. Caligula (37 AD - 41 AD)
4. Claudius (41 AD - 54 AD)
5. Nero (54 AD - 68 AD)
These emperors ruled during a crucial period in Roman history, often referred to as the Roman Empire's "Early Imperial Period." During their reigns, the Roman Empire expanded its territories, consolidated its political power, and experienced significant cultural, economic, and political developments.