Short answers, pulled from the story.
Hadrian, born Publius Aelius Hadrianus on the 24th of January 76, was Roman emperor from 117 to 138 and a member of the Nerva-Antonine dynasty. Born in Italica in southern Spain, he was a ward and relative of the emperor Trajan, whom he succeeded. Later historians counted him among Rome's so-called Five Good Emperors.
Hadrian was born in Italica, a Roman town in the province of Hispania Baetica in southern Spain, founded by Italic settlers during the Second Punic War at the initiative of Scipio Africanus. His branch of the Aelia gens took its name from Hadria, an ancient town in the Picenum region of Italy.
Hadrian initiated the wall in 122 to separate Romans from barbarians, marking the northern limit of Britannia. The wall deterred attacks at a lower cost than a massed border army and controlled cross-border trade and immigration. Hadrian concluded his visit to Britannia by the end of 122 and never saw the finished wall.
Antinous was a young man of humble birth who became Hadrian's lover. He drowned while Hadrian and his entourage were sailing on the Nile, with accident, suicide, murder, and religious sacrifice all postulated as causes. Hadrian had him deified and founded the city of Antinoöpolis in his honour on the 30th of October 130.
As Trajan lay dying, an adoption document naming Hadrian as heir was produced, but it was signed by Trajan's wife Plotina rather than by Trajan himself, and Hadrian was in Syria at the time. Trajan died at Selinus in Cilicia on the 8th of August 117. Ancient sources are divided on whether the adoption was genuine.
Soon after his succession Hadrian had four leading senators unlawfully put to death, earning the Senate's lifelong enmity. The Senate found him remote and authoritarian, and his reputation with it was irredeemably soured for the rest of his reign. He underscored his autocratic rule by frequent use of imperial decrees to bypass the need for Senate approval.
Hadrian died on the 10th of July 138 at his villa at Baiae, at the age of 62, after reigning for 21 years and suffering chronic illness in his final years. He was buried at Puteoli, and his remains were later transferred to Rome. His successor Antoninus Pius had him deified despite opposition from the Senate.