Short answers, pulled from the story.
Domitian was born on the 24th of October 51 as the youngest son of Emperor Vespasian and Flavia Domitilla Major. He was isolated from his family during his adolescence while his father and brother commanded armies in Germania and Judaea.
Domitian was extremely sensitive about his baldness and disguised it by wearing wigs and writing a book on hair care. This insecurity shaped his personality to be prone to suspicion and often led him to communicate in cryptic ways.
Domitian ascended to the throne on the 14th of September 81 and immediately launched a massive building program to restore Rome. He constructed around fifty structures including the Stadium of Domitian and the Odeon of Domitian while completing the Colosseum by adding a fourth level.
Domitian developed the Limes Germanicus and expanded the empire into Caledonia but recalled his general Agricola from Britain. He eventually negotiated a peace treaty with King Decebalus of Dacia in 88 that granted an annual subsidy of 8 million sesterces.
Domitian died on the 18th of September 96 when he was assassinated by court officials including his chamberlain Parthenius and a steward named Stephanus. The attack was carried out by a freedman of Parthenius named Maximus who used a concealed dagger.