Brennus was the legendary General and leader of the Senone, and defeated the Romans at two major battles. His legacy still exists, in the form of the destruction of Rome, and the creation of the Senone Republic. He is one of the most influential people in history, and largely set up the world for what it would become.
Very little is known about Brennus' early life, except that he was born around 410 AD, and by the age of 14 had established himself as a skilled warrior. He likely defeated enemy raiders, possibly from the boii tribe, but even this is not known for sure. By 390 AD, the former chieftain of the Senone had died, and Brennus was a strong candidate to be his Successor. After a brief power struggle with an unknown opponent, Brennus became the chieftain of the Senone.
The War on Rome
Arguably the most influential and Important event in Brennus' life was his successful war against the Roman Republic. It was started when Roman Diplomats killed Senone warriors while trying to settle a dispute between the Senones and the Etruscans. This angered Brennus, and he quickly made peace with the Etruscans , and marched his army into Roman territory, defeating them swiftly at the battle of Allia, and then chasing the army back to Rome, where he hoped to destroy the Roman Republic
Under Brennus, the Senone sacked and annihilated Rome, killing thousands of Roman soldiers and even more civilians. After this, Brennus and his troops marched to Veii to take on Marcus, the dictator of Rome. After eight days of fighting, Veii was taken and destroyed, and the Romans surrendered. During the Surrender, Brennus would kill Marcus yelling the now-famous words "Vae victis!" Thus securing his victory an sealing the fate of Rome.
The Umbrian War
After the defeat of Rome, Brennus cut a deal with the Etruscans. In exchange for A large sum of gold and other goods, The Senones would help conquer Umbria for the Etruscans. There, Brennus fought well, and was a master strategist, never losing a battle to the Umbrians and Losing very few troops. The war was overall successful, with the Umbrians taking huge casualties and eventually being able to annex the territory.
Brennus died far away from his homeland, on a diplomatic mission in Rome, discussing a mutual defense pact with the Etruscans, which was later agreed upon by other members of the delegation. It is unknown what killed him; at the time, it was thought he was poisoned, but contemporary scholars believe it to be some form of lung cancer. His body was buried near Rome, in a field said to be about four miles away from the city.
Brennus' legacy is defined primarily by war, but also by the eventual formation of the Senone Republic. His agreements with the Etruscans influenced both Etrusca and the Senone, and led the two nations to prosperity. He was a great warrior, and his adopted son who was also called Brennus continued his success in both combat and peace. Overall, he had extreme influence on his world, and his actions still affect the world today.