Who was the first roman emporer?

augustus

AnswerOctavianus... later called Caesar Augustus is considered as the first roman emperor. Please note that the most famous roman leader, Julius Caesar had chosen Augustus as his own son. Julius Caesar himself doesn't really count as emperor... he had been blaimed for concentrating the leading positions is one person (himself).

If by "empire" the Word commonly used for the principate, Octavian/Augustus was the first ruler.

True Answer

The first ruler of the Roman Empire was Romulus. You can disagree with me if you think that your smarter than a collage prep. middle school textbook.