Question: Gnaeus Pompeius of Pompeia became a member of the First Triumvirate along with this general and politician who played a key role in the transformation of the Roman Republic into the Roman Empire and was the second wealthiest person next to which person?
Context: Pompeia Magna (born 80/75 BC - before 35 BC) was the only daughter and second child born to Roman triumvir Pompey the Great (Gnaeus Pompeius Magnus) from his third marriage, to Mucia Tertia.  Her elder brother was Gnaeus Pompeius and her younger brother was Sextus Pompey. The gens Pompeia was a plebeian family at ancient Rome, first appearing in history during the second century BC, and frequently occupying the highest offices of the Roman state from then until imperial times.  The first of the Pompeii to obtain the consulship was Quintus Pompeius in 141 BC, but by far the most illustrious of the gens was Gnaeus Pompeius, surnamed "Magnus", a distinguished general under the dictator Sulla, who became a member of the First Triumvirate, together with Caesar and Crassus.  After the death of Crassus, the rivalry between Caesar and Pompeius led to the Civil War, one of the defining events of the final years of the Roman Republic. Gnaeus Pompeius Magnus (] ; 29 September 106 BC – 28 September 48 BC), usually known in English as Pompey or Pompey the Great, was a military and political leader of the late Roman Republic.  He came from a wealthy Italian provincial background, and his father had been the first to establish the family among the Roman nobility.  Pompey's immense success as a general while still very young enabled him to advance directly to his first consulship without meeting the normal requirements for office.  His success as a military commander in Sulla's second civil war resulted in Sulla bestowing the nickname "Magnus", "the Great", upon him.  He was consul three times and celebrated three triumphs. The Second Triumvirate is the name historians have given to the official political alliance of "Gaius Julius Caesar Octavianus" (Caesar Augustus), "Marcus Antonius" (Mark Antony), and "Marcus Aemilius Lepidus", formed on 27 November 43 BC with the enactment of the "Lex Titia", the adoption of which is viewed as marking the end of the Roman Republic.  The Triumvirate existed for two five-year terms, covering the period 43 BC to 33 BC.  Unlike the earlier First Triumvirate, the Second Triumvirate was an official, legally established institution, whose overwhelming power in the Roman state was given full legal sanction and whose "imperium maius" outranked that of all other magistrates, including the consuls. Sextus Pompeius Magnus Pius, in English Sextus Pompey (67 BC – 35 BC), was a Roman general from the late Republic (1st century BC).  He was the last focus of opposition to the Second Triumvirate.  His father was Gnaeus Pompeius Magnus (Pompey the Great). Gnaeus Pompey Magnus is a character in the HBO/BBC2 original television series "Rome", played by Kenneth Cranham.  He is depicted as a legendary general, past the days of his prime, who tries to recapture the glories of his youth as much as to do what is right for the Republic.  The real Gnaeus Pompeius Magnus was a Roman general and politician, who, while as ambitious as Caesar, and just as unorthodox in his youth, chose to ally himself with the optimates in opposing Caesar and supporting the traditional Roman Republic. Quintus Valerius Pompey is a fictional character in the HBO/BBC2 original television series, "Rome", played by Rick Warden.  He is described as the "natural son" of Pompey.  The basis for this character is unclear.  There is no historical mention of a "Quintus Valerius Pompey", though a lineage with the name Quintus Pompeius (relatives of Pompeia, wife of Julius Caesar) instead existed, but the character may be meant to represent the two sons of Pompey, Sextus Pompeius and Gnaeus Pompeius.  He is mentioned to be a great sailor, a trait which Sextus Pompeius had.  He also exhibits some of traits reportedly held by the Optimate general Titus Labienus. Marcus Licinius Crassus ( ; c. 115–53 BC) was a Roman general and politician who played a key role in the transformation of the Roman Republic into the Roman Empire.  Amassing an enormous fortune during his life, Crassus is, excepting Augustus Caesar, considered the wealthiest man in Roman history. The Battle of Munda (17 March 45 B.C.), in southern Hispania Ulterior, was the final battle of Caesar's civil war against the leaders of the Optimates.  With the military victory at Munda, and the deaths of Titus Labienus and Gnaeus Pompeius (eldest son of Pompey), Caesar was politically able to return in triumph to Rome, and then govern as the elected "Roman dictator".  Subsequently, the assassination of Julius Caesar began the Republican decline that led to the Roman Empire, initiated with the reign of the Roman Emperor Augustus. Pompeia (flourished late 2nd century BC & 1st century BC) was a Roman noblewoman of plebs status.  Her mother was a Roman woman whose name is unknown and her father was the consul and general Gnaeus Pompeius Strabo.  Pompeia’s brother was the triumvir Gnaeus Pompeius Magnus or Pompey the Great.  She is the paternal aunt to Gnaeus Pompeius, Sextus Pompeius and Pompeia Magna, the children of her brother.
Answer: Augustus Caesar