Drusus Minor in Harpers Dictionary

The son of the emperor Tiberius by Vipsania, daughter of Agrippa. He served with distinction in Pannonia and Illyricum, and was consul with his father, A.D. 21. In a quarrel with the imperial favourite Seianus, he gave the latter a blow in the face. Seianus, in revenge, seduced his wife Livia or Livilla, daughter of Drusus the elder and of Antonia; and the guilty pair destroyed Drusus by poison, which was administered by the eunuch Lygdus. The crime remained a secret for eight years, when it was discovered after the death of Seianus, and Livia was put to death (Tac. Ann. i. 24, etc.; iv. 3 foll.).