206 BC

By place

Roman Republic

• In the Battle of Ilipa in Spain, the Carthaginian generals, Mago Barca and Hasdrubal Gisco, are defeated by the Roman general Publius Cornelius Scipio. Mago retreats to Gades and then sails for the Balearic Islands.
• The Roman general Publius Cornelius Scipio secures Gades, thus making Roman control of Spain complete. With the effective withdrawal of the Carthaginians from Spain, Hispania becomes a Roman province.
• The city of Italica is founded by Scipio as a place to settle for the Roman soldiers wounded in the Battle of Ilipa.
• After having successfully driven the Carthaginians out of Spain, Scipio returns in triumph to Rome and is elected consul. He then prepares to carry the war into Carthage's territory in North Africa.

Carthage

• Hasdrubal Gisco retreats to the coast and then crosses to North Africa, where he gives his daughter in marriage to Syphax, king of the Numidian Masaesyli tribe, to formalize their military alliance.
• After being an ally of Carthage and fighting with them, Numidian chieftain, Masinissa switches sides when the Carthaginians are driven from Spain and offers to assist Rome. Syphax expels his rival Masinissa and claims himself to be King of Numidia. The Romans support Masinissa's claim to the Numidian throne against Syphax, the pro-Carthaginian ruler of the Masaesyli tribe.

Persia

• Arsaces II, king of the Parthians, loses territory in battles with Euthydemus I, ruler of Bactria.
• Antiochus III marches across the Hindu Kush into the Kabul valley and renews his friendship with the Indian king Sophagasenus.

Greece

• The war between Macedonia and Rome drags on with no decisive advantage on either side. Rome's interest lies not in conquest, but in keeping Macedon, the Greek city-states and Greek political leagues continually divided and non-threatening.
• Philip V of Macedon is able to take advantage of Roman inactivity. After sacking Thermum, the religious and political centre of Aetolia, Philip is able to force the Aetolians to accept a peace treaty based on his terms.

China

• A period of civil war known as the Chu-Han contention begins.
• Xiang Yu divides China in a power-sharing arrangement known as the Eighteen Kingdoms, with himself the de facto supreme ruler as Hegemon-King of Western Chu.
• Xiang Yu appoints [Emperor Emperor Yi of Chu|Yi of Chu|Huai II of Chu] as Emperor Yi of China, but he has him assassinated later in the year.
• Liu Bang, as the newly appointed king of Hanzhong, and his new General-in-Chief Han Xin, invade Guanzhong, defeat the king of Yong, Zhang Han, and conquer the lands of the Three Qins, thus beginning hostilities with Xiang Yu.
• Liu Bang makes Yueyang his capital and begins to expand his realm into the Central Plain.
• Xiang Yu campaigns against a rebellion in Qi.
• The Jian and Dao swords are created during this time.