Marcus Crassus first emerged to prominence as a commander in the army of Lucius Sulla. In the political turmoil that followed Sulla’s reforms, Crassus amassed an immense personal fortune and became the wealthiest man in Rome. Crassus would later form the First Triumvirate, with Pompey and Caesar, which collectively governed Rome for ten years before Crassus’ death at the Battle of Carrhae in 53 BCE.

The Battle of Pharsalus was fought in 48 BCE, between the forces of the Roman Republic loyal to Pompey the Great and the experienced legions of Julius Caesar. It ended in victory for Julius Caesar and forced Pompey to flee to Egypt, where he was promptly murdered. The Battle of Pharsalus allowed Caesar to consolidate his power in Rome and eventually have himself declared dictator for life.

Marcus Crassus first gained widespread notoriety in the Roman Republic for commanding the forces of Lucius Sulla in the latter’s takeover of the Roman Republic. Crassus later gained political success and fame when he led the Roman army that defeated the slave uprising of Spartacus.

The Pyrrhic War was fought between the rapidly growing Roman Republic (supported by Carthage) and the declining power of Magna Graecia. It was one of the most important conflicts in the Roman unification of Italy and contributed to the eventual Roman conquest of the Greek-speaking world.

Spartacus was a former gladiator and slave who led a slave uprising during the waning years of the Roman Republic. The so-called Third Servile War was the last of a series of slave uprisings in the Roman Republic. It was also the most successful and for a time, in 72 BCE, it looked like the city of Rome might be threatened itself. The rebellion was eventually crushed by a Roman army led by Marcus Crassus.

The Social War was fought in the early years of the first century BCE, between Rome and an alliance of dissatisfied Italian city-states under Roman control. Lucius Sulla led Roman armies to many successful victories in the Social War, which enabled him to become powerful and popular enough to seize the dictatorship of Rome for himself.

The Battle of Actium was fought in 31 BCE. It was the final battle of the the civil war between Octavian and Mark Antony. It ended in victory for the forces of Octavian (who later had himself crowned Augustus Caesar). It also led to Rome taking control of the Ptolemaic Kingdom of Egypt.

The Battle of Carrhae was fought in 53 BCE between the forces of the Roman Republic (led by Marcus Crassus) and the forces of the Parthian Empire. The battle ended in defeat for the Roman armies and witnessed the death of Marcus Crassus. Crassus had been one of the members of the First Triumvirate, along with Caesar and Pompey, and the wealthiest man in Rome.

The history of Rome is the history of constant power struggles. For example, Julius Caesar and Pompey the Great; Lucius Sulla and Gaius Marius; Hannibal and Scipio Africanus; Octavian and Mark Antony. However, Marcus Crassus and Tiberius Gracchus were neither rivals for power nor contemporaries. Marcus Crassus formed part of the First Triumvirate with Julius Caesar and Pompey the Great. Tiberius Gracchus is most well known for his failed attempts at reforming land ownership in the Roman Republic.

The patricians exerted political and social dominance over the plebian class for several centuries in Roman history. The plebians would eventually establish their own political offices within the political structure. The other answers are incorrect because they refer to specific Roman political positions fulfilled by individuals, not an entire class of people.