son of Livia,
stepson of Augustus,
brother of Tiberius &
father of Claudius

Born after his mother was divorced.
Conqueror of Germany. Died after fall from horse.

References: Josephus, Antiquities 15.336;
                   Suetonius, Life of Tiberius 7, 52. 
                   ______, Life of Claudius 1-2                  

Other resources on line:

• Nero Claudius Drusus - detailed biography in Wikipedia's growing web.

• Drusus - Jona Lendering's timeline of the life of conqueror of Germany [Livius.org].