The Civil Wars of the Late Roman Republic

While the Roman army is rightly famed as an institution, the image of the individual legionary is also an iconic one. The uniformed, disciplined soldier of the late Republic and early Empire is one of the first things many people imagine when they think of Rome. They are the ultimate image of the ancient soldier, their arms and armor instantly recognizable. Their abilities, not only as warriors but also as engineers and administrators, have made them role models for other soldiers through the centuries. In the same vein, their commanders are still celebrated and studied, and generals the world over have tried to emulate the likes of Julius Caesar.
Caesar is still remembered for winning a civil war and helping bring about the end of the Roman Republic, leaving a line of emperors in its place, but it's quite possible that none of what Caesar did would've happened without the template for such actions being set 40 years earlier. At the time, when Caesar was in his teens, war was being waged both on the Italian peninsula and abroad, with domestic politics pitting the conservative, aristocratic optimates against the populist, reformist populares, and this tension ultimately escalated into an all-out war. One of the leading populares was Caesar's uncle, Gaius Marius, a military visionary who had restructured the legions and extended the privileges of land ownership and citizenship to legionaries on condition of successful completion of a fixed term of service. In the late 2nd century B.C., Marius had waged a successful campaign against several Germanic tribes, and after earning eternal fame in the Eternal City, Marius was appointed a consul several times. In 88 B.C., he entered into conflict with his erstwhile protégé, the optimate Sulla, over command of the army to be dispatched against Mithridates VI of Pontus, a long-time enemy of Rome and its Greek allies.
Sulla had become renowned in Rome as a general during the Jugurthine, Social, and Mithridatic Wars, but naturally he is now remembered for the gruesome acts committed during his tenure as Rome's first lifelong dictator. Sulla's unprecedented period of one-man rule is viewed by many historians as a means of re-establishing peace and order in Roman politics while safeguarding the Republican system from abuse by powerful individuals. In other words, with no small amount of irony, Sulla justified assuming sole power temporarily to prevent others from doing so in the future.
Alexander Hamilton, the famous American patriot, once remarked that "the greatest man who ever lived was Julius Caesar". Such a tribute, coming from one of the Founding Fathers of the quintessential modern democracy in reference to a man who destroyed the Roman Republic, is testament to the enduring mark that Caesar left upon the world. The ultimate conqueror, statesman, dictator, visionary, and opportunist, during his time in power Caesar expanded the borders of Rome to almost twice their previous size, revolutionized the infrastructure of the Roman state, and destroyed the Roman Republic for good, leaving a line of emperors in its place. His legacy is so strong that his name has become, in many languages, synonymous with power: the emperors of Austria and Germany bore the title Kaiser, and the Tsars of Russia also owe the etymology of their title to Caesar.