Nero Claudius Drusus Germanicus (38–9 BC), also called Drusus the Elder, was a Roman politician and military commander. He was a patrician Claudian on his birth father's side but his maternal grandmother was from a plebeian family. He was the son of Livia Drusilla and the legal stepson of her second husband, the Emperor Augustus. He was also brother of the Emperor Tiberius, father to both the Emperor Claudius and general Germanicus, paternal grandfather of the Emperor Caligula, and maternal great-grandfather of the Emperor Nero. He launched the first major Roman campaigns across the Rhine and began the conquest of Germania, becoming the first Roman general to reach the Weser and Elbe rivers. In 12 BC, Drusus led a successful campaign into Germania, subjugating the Sicambri. Later that year he led a naval expedition against Germanic tribes along the North Sea coast, conquering the Batavi and the Frisii, and defeating the Chauci near the mouth of the Weser. In 11 BC, he conquered the Usipetes and the Marsi, extending Roman control to the Upper Weser. In 10 BC, he launched a campaign against the Chatti and the resurgent Sicambri, subjugating both. The following year, while serving as consul, he conquered the Mattiaci and defeated the Marcomanni and the Cherusci, the latter near the Elbe. His Germanic campaigns were cut short in the summer of 9 BC by his death after a riding accident. Drusus was a very able commander. His death slowed the northward expansion of the Roman empire, and foreshadowed the disastrous Battle of the Teutoburg Forest. He was enormously popular among his men, who erected the Drususstein in his honor; his memory was elevated during the reign of his son Claudius. Drusus' accomplishments in battle were considerable. He fought numerous Germanic chiefs in single combat, and was likely the fourth and final Roman to achieve the spolia opima (for taking the armor and weapons of an enemy king after defeating them in single combat), though he died before he could be honored for it. Early life Childhood Drusus was the youngest son of Livia Drusilla from her marriage to Tiberius Claudius Nero, who was legally declared his father before the couple divorced. Drusus was born between mid-March and mid-April 38 BC, three months after Livia married Augustus on 17 January. Gerhard Radke has proposed the date of 28 March as his most likely birthday, while Lindsay Powell interprets