Titus Atius Labienus (ca. 100 BC – March 17, 45 BC) was a professional Roman soldier in the late Roman Republic. He served as Tribune of the Plebs in 63 BC, and is remembered as one of Julius Caesar's lieutenants, mentioned frequently in the accounts of his military campaigns. He was the father of Quintus Labienus.

Reasoning from the fact that his praetorship was in 60 or 59 BC, Titus Labienus most likely was born in 99 or 98 BC. Many sources suggest that he came from the town of Cingulum in Picenum. His family was of equestrian status. He most likely had early ties with Pompey during his time as a patron for Picenum and his desire to rise in military rank. His early service was ca. 78–75 BC in Cilicia under Publius Servilius Vatia Isauricus.

In 63 BC, Titus Labienus was a Tribune of the Plebs with close ties to Pompey. Gaius Julius Caesar was also working closely with Pompey and therefore he and Labienus occasionally cooperated. These interactions were the seed that eventually developed into a friendship between Labienus and Caesar.

Titus (Latin: Titus Flavius Caesar Vespasianus Augustus; 30 December 39 – 13 September 81), was Roman Emperor from 79 to 81. A member of the Flavian dynasty, Titus succeeded his father Vespasian upon his death, thus becoming the first Roman Emperor to come to the throne after his own father.

Prior to becoming Emperor, Titus gained renown as a military commander, serving under his father in Judaea during the First Jewish-Roman War. The campaign came to a brief halt with the death of emperor Nero in 68, launching Vespasian's bid for the imperial power during the Year of the Four Emperors. When Vespasian was declared Emperor on 1 July 69, Titus was left in charge of ending the Jewish rebellion. In 70, he successfully laid siege to and destroyed the city and Temple of Jerusalem. For this achievement Titus was awarded a triumph; the Arch of Titus commemorates his victory to this day.

Under the rule of his father, Titus gained notoriety in Rome serving as prefect of the Praetorian Guard, and for carrying on a controversial relationship with the Jewish queen Berenice. Despite concerns over his character, Titus ruled to great acclaim following the death of Vespasian in 79, and was considered a good emperor by Suetonius and other contemporary historians. As emperor, he is best known for completing the Colosseum and for his generosity in relieving the suffering caused by two disasters, the Mount Vesuvius eruption of 79 and a fire in Rome in 80. After barely two years in office, Titus died of a fever on 13 September 81. He was deified by the Roman Senate and succeeded by his younger brother Domitian.