September 18
Birth of Trajan in Spain.
The father of Trajan serves as governor of Syria.
Death of Hadrian‘s parents. He and his sister become wards of Trajan.
Trajan directs the quelling of a coup by Antonius Saturninus against Domitian.
Marriage of Trajan to Pompeia Plotina.
Trajan serves as consul.
November
Nerva designates Trajan as his successor.
January 27
Nerva dies at his villa. Trajan becomes Emperor.
Trajan enters Rome in great ceremony.
Trajan serves as consul for the third time.
Hadrian is in Trajan’s entourage during the First Dacian War, likely to keep records.
May
Trajan launches his first Dacian campaign.
Trajan defeats Decebalus and makes Dacia a client kingdom.
Nicopolis ad Istrum is founded by Trajan.
Trajan completes the reconstruction of the Circus Maximus.
Decebalus attempts to kill Trajan via Roman deserters, but the plan fails.
Trajan constructs a bridge across the Danube.
Decebalus crosses the Danube in an attack on Roman properties controlled by Trajan.
Adramytteion severely damaged during an earthquake. Trajan provides funds to rebuild it.
Arabia Petraea is annexed by Trajan.
Trajan takes Sarmisegetusa Regia, the capital of Decabalus, who commits suicide.
Trajan annexes the Nabataean Kingdom.
March 22
Trajan conquers the Nabataean Kingdom shortly after the death of Rabbel II.
The Forum of Trajan is completed.
The Traiana Nova is constructed from Aqaba to Bostra by Trajan.
Trajan devalues the denarius from 93.5% to 89.0% silver.
Trajan holds 123 days of games to celebrate his Dacian victory.
The Via Traiana is completed to reach Brundisium by Trajan at his own expense.
The Aqua Traiana is constructed in Rome by Trajan.
Trajan constructs the Tropaeum Traiani in Romania to commemorate his victory over the Dacians.
July
The Baths of Trajan are completed in Rome.
Completion of the Column of Trajan.
Trajan embarks on a campaign against Parthia.
Trajan takes Armenia and annexes it as a Roman province.
The Diaspora Revolt results in major damage to Alexandria and the near annihilation of its Jewish community. Trajan uses the occasion to rebuild the city.
While being visited by the Emperor Trajan, Antioch is severely damaged in an earthquake. The same earthquake heavily damages Apameia on the Axios.
Roman Emperor Trajan briefly occupies Babylon during his campaign against the Parthian Empire.
Hadrian joins Trajan’s Parthian campaign as legate.
Trajan takes Nisibis and Batnae and creates a province of Mesopatamia.
During Emperor Trajan’s Parthian campaign, Adiabene is briefly occupied by Roman forces as part of their conquest of Mesopotamia.
Pliny the Younger, serving as the Roman governor of Bithynia et Pontus, writes to Emperor Trajan about various administrative matters in the province, including Amastris.
The Arch of Trajan is completed.
August 8
Trajan dies in Selinos, Cilicia. Hadrian becomes Emperor.