Emperor Titus (AD 39–81), Titus Flavius Vespasianus, later Titus Flavius Caesar Vespasianus Augustus, was Roman emperor from AD 79 to 81.
Flavia Domitilla, daughter of Domitilla the Younger by an unknown father, perhaps Quintus Petillius Cerialis, had the same name as her mother and her grandmother Domitilla the Elder.
 She was thus a granddaughter of Emperor Vespasian and a niece of Emperors Titus and Domitian.
 She married her cousin, the consul Titus Flavius Clemens, a nephew of Vespasian.
Titus Flavius T. f. T. n. Sabinus (d. December 20, AD 69) was a Roman politician and soldier.
 A native of Reate, he was the elder son of Titus Flavius Sabinus and Vespasia Polla, and brother of the Emperor Vespasian.
Titus Flavius Clemens (Greek: Κλήμης ὁ Ἀλεξανδρεύς ; c. 150 – c. 215), known as Clement of Alexandria to distinguish him from the earlier Clement of Rome, was a Christian theologian who taught at the Catechetical School of Alexandria.
 A convert to Christianity, he was an educated man who was familiar with classical Greek philosophy and literature.
 As his three major works demonstrate, Clement was influenced by Hellenistic philosophy to a greater extent than any other Christian thinker of his time, and in particular by Plato and the Stoics.
 His secret works, which exist only in fragments, suggest that he was also familiar with pre-Christian Jewish esotericism and Gnosticism.
 In one of his works he argued that Greek philosophy had its origin among non-Greeks, claiming that both Plato and Pythagoras were taught by Egyptian scholars.
 Among his pupils were Origen and Alexander of Jerusalem.
Clementine literature (also called Clementina, Pseudo-Clementine Writings, Kerygmata Petrou, Clementine Romance) is the name given to the religious romance which purports to contain a record made by one Clement (whom the narrative identifies as both Pope Clement I, and Domitian's cousin Titus Flavius Clemens) of discourses involving the Apostle Peter, together with an account of the circumstances under which Clement came to be Peter's travelling companion, and of other details of Clement's family history.
Titus Flavius Claudius Sulpicianus (ca.
 137 AD – 197 AD) was a Roman statesman who served as Senator and Consul suffectus.
 He attempted to become Roman Emperor after the death of his son-in-law Emperor Pertinax in 193.
Titus Flavius Simonides Agrippa, also known as Titus Flavius Agrippa (Greek: , flourished second half of 1st century & first half of 2nd century, born 79), was an aristocratic, wealthy Roman Jew.
Titus Flavius T. f. T. n. Clemens was a nephew of the Roman Emperor Vespasian.
 He was the son of Titus Flavius Sabinus, consul in AD 47 and "praefectus urbi" during the reign of Nero, and a brother of Titus Flavius Sabinus, consul in AD 82.
 The emperors Titus and Domitian were his cousins.
Titus Flavius Titianus was Procurator of Alexandria during the reign of Caracalla.
 He was put to death by Theocritus, the favourite of Caracalla, "circa" AD 216.
 He is probably the same Titus Flavius Titianus who was consul "suffectus" about AD 200; that Titianus was the son of Titus Flavius Claudius Sulpicianus, and brother of Flavia Titiana, the wife of the emperor Pertinax.
Domitian ( ; Latin: "Titus Flavius Caesar Domitianus Augustus" ; 24 October 51 – 18 September 96) was Roman emperor from 81 to 96.
 He was the younger brother of Titus and son of Vespasian, his two predecessors on the throne, and the last member of the Flavian dynasty.
 During his reign, his authoritarian rule put him at sharp odds with the senate, whose powers he drastically curtailed.

Question: Titus Flavius Clemens was a cousin to the Roman emperor who ruled during what years?
Answer: 81 to 96