Roman emperors were the rulers of the Roman Empire. The first Roman emperor, Augustus, refused to be called an emperor instead choosing the title 'princeps', which means the first or leading citizen. Augustus avoided the term emperor or king as the people of Rome weren't too keen on monarchs after the previous one.
Roman emperors would declare the opening and closure of Senate meetings, they would declare the Senate's agenda and would impose rules and regulations which the Senate had to follow.
Roman emperors had multiple roles and power within the Senate. For example; when Augustus became emperor he granted himself the role of 'Pontifex Maximus', this made him the chief administrator of religious affairs, which gave him control of the Roman calendar and the power to appoint the vestal virgins.
Ruled between: 27BC - 14AD
Augustus became the first emperor of Rome, after replacing the Roman Republic with the Empire. Augustus was born on the 23rd of September in 63BC, and was named Octavian. However, in 27BC when his reign began the Senate awarded him the name Augustus.
Augustus was reluctant to call himself a dictator or a king and instead founded the principate. This allowed him to hold power for life under the name of 'leading-citizen'. Even though this title gave him no power, he was awarded multiple positions of great influence within the senate.
His reign lasted for forty-one years, and Augustus is viewed as one of the most important figures in Roman history. He died on the 19th of August 14AD and installed Tiberius, his step-son as his successor.
Constantine the Great
Ruled between: 307AD - 337AD
Constantine was the first Christian Roman emperor, and made it the official religion of the Empire. He also created a new capital for the Empire, Constantinople. In the new city he also installed a second senate.
Ruled between 37AD - 41AD
Caligula, more properly Gaius Julius Caesar Germanicus was the third emperor of Rome and had succeeded Tiberius. From the age of 2 to 4 he lived with his father in the Roman legions; whilst there he was given the nickname Caligula, which can be translated as 'little boots'. Gaius disliked the senate and tried to humiliate them whenever possible. It is stated that he attempted to make his horse consul of Rome!