second Roman emperor, born at Rome; was of the Claudian family; became the step-son of Augustus, who, when he was five years old, had married his mother; was himself married to Agrippina, daughter of Agrippa, but was compelled to divorce her and marry Augustus's daughter Julia, by whom he had two sons, on the death of whom he was adopted as the emperor's successor, whom, after various military services in various parts of the empire, he succeeded A.D. 14; his reign was distinguished by acts of cruelty, specially at the instance of the minister Sejanus, whom out of jealousy he put to death; given up to debauchery, he was suffocated in a fainting fit by the captain of the Prætorian Guards in A.D. 37, and succeeded by Caligula; it was during his reign Christ was crucified.
Rev. James Wood. The Nuttall Encyclopedia (1907)
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[He] was one of Rome's greatest generals; his conquest of Pannonia, Dalmatia, Raetia, and temporarily, parts of Germania, laid the foundations for the northern frontier. But he came to be remembered as a dark, reclusive, and sombre ruler who never really desired to be emperor; Pliny the Elder called him tristissimus hominum, "the gloomiest of men."
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In the seventh chapter he tells how, crowned with laurel, lest lightning might strike him, he had sat, as Tiberius, in a garden at Capri, reading the shameful books of Elephantis, while dwarfs and peacocks strutted round him, and the flute-player mocked the swinger of the censer; and, as Caligula, had caroused with the green-shirted jockeys in their stables and supped in an ivory manger with a jewel-frontleted horse;