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His wife was a sister of the conspirator Caepio, a factor thought to have kept him from suitable political advance.
Dio Cassius (LIV 6.5) claims he said to the then emperor: "you have made him so great that he must either become your son-in-law or be executed." The emperor accepted this advice and followed the first option.
Horace addressed poems to him.
Yesterday's place to guess is connected with him.