The Battle of Hyrba was the first battle between the Persians and Medians, taking place around 552 BC. It was also the first battle after the Persians had revolted. These actions were led (for the most part) by Cyrus the Great, as he shifted the powers of the ancient Middle East. The Persian success in the battle led to the creation of Persia's first empire and began Cyrus's decade long conquest of almost all of the known world. Though the only authority with a detailed account of the battle was Nicolaus of Damascus, other well-known historians such as Herodotus, Ctesias, and Strabo also mention the battle in their own accounts.