According to Suetonius, Pinarius was a grandnephew of dictator Gaius Julius Caesar by one of his sisters, Julia Major. His cousins were the consulQuintus Pedius, Octavia Minor, and Octavian. His father was a member of the gens Pinaria, an ancient, distinguished family of patrician status. The family can be traced to the foundations of Rome. Various members of the gens served as priests and were among the first to serve as consuls in the republic. Little is known on Scarpus' early life. He is first mentioned in the ancient sources when Caesar was assassinated in Rome in March 44 BC. In the will of Caesar, Scarpus received one eighth of the property of the dictator, the same amount as Pedius. The main heir of Caesar was Octavian, who received three quarters of the property of his great uncle. But Scarpus and Pedius also assigned their inheritance to Octavian. Scarpus became an ally to Mark Antony and commanded for him in the war against the murderers of Caesar, Marcus Junius Brutus and Gaius Cassius Longinus. In the years leading up to the Final War of the Roman Republic, in Actium, Greece 31 BC, Antony appointed Scarpus to the military command of Cyrenaica. Scarpus had with him four legions to command. During his time in Cyrenaica, Scarpus had control of the currency mint in Cyrene, as he became a moneyer. Scarpus had issued various coins bearing Antony's name and Scarpus’ name was inscribed as an issuer of those coins. After Antony and his lover, the PtolemaicGreekQueen Cleopatra VII of Egypt, were defeated by Octavian at Actium, they sailed back to North Africa. Antony sent messengers to Scarpus for help. But Scarpus refused to see Antony's messengers and put them to death. Instead, he changed sides. He gave his legions to Gaius Cornelius Gallus, Octavian's lieutenant, to command. While Octavian marched from the East through Asia, Syria and Judea against Egypt, Cornelius Gallus advanced with Scarpus’ legions from the west against Alexandria. When Antony and Cleopatra died, Octavian became the new Roman master and then emperor. Augustus had appointed his cousin as the Roman governor of Cyrenaica. Scarpus, as he did for Antony, became a moneyer and had issued various coins bearing Augustus’ name. On these coins, Scarpus had his name inscribed as an issuer of the coins. Beyond that, nothing is known of Scarpus.
In fiction
Lucius Pinarius is the protagonist in the last part of Steven Saylor's book Roma. The book follows the known facts of his life but adds many episodes not attested in historical sources. As depicted in the book, on the last evening of his life Julius Caesar had a long personal talk with Pinarius, telling of his plans for conquest of Parthia and beyond and promising Pinarius a share in the greater Roman Empire which Caesar envisaged. On the following day, while visiting the house of Brutus, Pinarius discovered the plot to kill Caesar, ran as fast as he could in order to warn him - but arrived just too late, only in time to see Caesar being actually assassinated. In a later part Saylor depicts Pinarius as being secretly in love with Cleopatra and - wanting to spare her humiliation and degradation at the hands of the victorious Augustus - providing her with the asp with which she committed suicide.