Augustus ( 63 BC - 14 AD)
Augustus was the founder of the Roman Empire and its first Emperor, ruling from 27 BC until his death in 14 AD. After the demise of the Second Triumvirate, Augustus restored the outward facade of the free Republic, with governmental power vested in the Roman Senate, the executive magistrates, and the legislative assemblies. In reality, however, he retained his autocratic power over the Republic as a military dictator. By law, Augustus held a collection of powers granted to him for life by the Senate, including supreme military command, and those of tribune and censor. It took several years for Augustus to develop the framework within which a formally republican state could be led under his sole rule. He rejected monarchical titles, and instead called himself Princeps Civitatis ("First Citizen"). The resulting constitutional framework became known as the Participate, the first phase of the Roman Empire. Here is more information on Augustus
Diocletian (244-311)
Diocletian 244 – 311, was a Roman Emperor from 284 to 305. In spite of his failures, Diocletian's reforms fundamentally changed the structure of Roman imperial government and helped stabilize the Empire economically and militarily, enabling the Empire to remain essentially intact for another hundred years despite being near the brink of collapse in Diocletian's youth. Weakened by illness, Diocletian left the imperial office on 1 May 305, and became the only Roman emperor to voluntarily abdicate the position. He lived out his retirement in his palace on the Dalmatian coast, tending to his vegetable gardens. His palace eventually became the core of the modern-day city of Split. Here is more information on Diocletian.
Theodosius I (347- 395)
Theodosius I 395), also known as Theodosius the Great, was Roman Emperor from 379 to 395. Theodosius was the last emperor to rule over both the eastern and the western halves of the Roman Empire. During his reign, the Goths secured control of Illyricum after the Gothic War, establishing their homeland south of the Danube within the empire's borders. He also issued decrees that effectively made Nicene Christianity the official state church of the Roman Empire. He is recognized by the Eastern Orthodox Church as Saint Theodosius. He defeated the usurpers Magnus Maximus and Eugenius and fostered the destruction of some prominent pagan temples: the Serapeum in Alexandria, the Temple of Apollo in Delphi, and the Vestal Virgins in Rome. In 393, he banned the Olympics in Ancient Greece. It was not until the 19th century, in 1896, that the Olympics were held again. After his death, Theodosius' sons Arcadius and Honorius inherited the East and West halves respectively, and the Roman Empire was never again re-united.
Boëthius 480-525 AD
Anicius Manlius Severinus Boëthius, commonly called Boethius, was a philosopher of the early 6th century. He was born in Rome to an ancient and prominent family which included emperors Petronius Maximus and Olybrius and many consuls. His father, Flavius Manlius Boethius, was consul in 487 after Odoacer deposed the last Western Roman Emperor. Boethius, of the noble Anicia family, entered public life at a young age and was already a senator by the age of 25. Boethius himself was consul in 510 in the kingdom of the Ostrogoths. In 522 he saw his two sons become consuls. Boethius was imprisoned and eventually executed by King Theodoric the Great, who suspected him of conspiring with the Eastern Roman Empire. While jailed, Boethius composed his Consolation of Philosophy, a philosophical treatise on fortune, death, and other issues. The Consolation became one of the most popular and influential works of the Middle Ages. A link between Boethius and a mathematical board game Rithmomachia has been made.