Rome was an Empire for over 500 years. During this time there were over 140 different emperors!
Augustus: Augustus was the first emperor. He was Julius Caesar's adopted son. Meet Emperor Augustus - The First Roman Emperor
Nero: Nero was quite young when he became emperor. At first Nero was a very good emperor. Unfortunately, he slowly became insane. Emperor Nero was insane.
Trajan: Trajan was Spanish. He was the first Roman emperor who was not from Italy. Under Trajan, the empire reached its greatest size.
Diocletian: The Roman empire had grown too big to manage effectively so Diocletian split the empire into two pieces, the Eastern Roman Empire (which included the city of Rome) and the Western Roman Empire.
Constantine: Constantine converted to Christianity and became the first Christian Roman emperor. He ruled the Eastern Roman Empire. Byzantium, the capital city, was renamed Constantinople, in his honor.
Valens: Emperor Valens & the Barbarians