Short answers, pulled from the story.
Nero Claudius Drusus (38-9 BC) was a Roman general who launched the first major campaigns across the Rhine into Germania. He was the stepson of Emperor Augustus and the father of Emperor Claudius, with three later emperors counting him as a direct ancestor: his son Claudius, his grandson Caligula, and his great-grandson Nero.
Nero Claudius Drusus died in the summer of 9 BC after falling from his horse while returning from his advance to the Elbe river. Infection set in over the following weeks, and he died roughly a month after the accident. His brother Tiberius had joined the campaign and was with him when he died.
Nero Claudius Drusus conducted four consecutive campaigns into Germania from 12 BC to 9 BC, subjugating or concluding treaties with the Chauci, Sicambri, Batavi, Frisii, Usipetes, Marsi, Chatti, and Cherusci. He became the first Roman general to reach the Weser and Elbe rivers, crossing the Elbe in the final campaign of 9 BC.
The spolia opima was Rome's highest individual military honor, awarded to a general who personally defeated an enemy king in combat and stripped him of his armor and weapons. Nero Claudius Drusus is considered likely the fourth and final Roman in history to have achieved it, but he died before the formal ceremony could take place.
Nero Claudius Drusus and his wife Antonia Minor had three surviving children: the general Germanicus, the future Emperor Claudius, and a daughter named Livilla. Three later emperors were his direct descendants: Claudius his son, Caligula his grandson, and Nero his great-grandson.
After the death of Nero Claudius Drusus in 9 BC, Roman expansion into Germania stalled under a succession of less capable commanders. Publius Quinctilius Varus eventually lost his entire army at the Battle of the Teutoburg Forest, and the Rhine became the de facto permanent border of the Roman Empire.