The Annals and the Histories · Ann. 2.84

While men's sorrow was yet fresh, Germanicus's sister Livia, who was married to Drusus, gave birth to twin sons. This, as a rare event, causing joy even in humble homes, so delighted the emperor that he did not refrain from boasting before the senators that to no Roman of the same rank had twin offspring ever before been born. In fact, he would turn to his own glory every incident, however casual. But at such a time, even this brought grief to the people, who thought that the increase of Drusus's family still further depressed the house of Germanicus.

Cornelius Tacitus · trans. Church & Brodribb, 1876
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