280 BC

Millennium:	1st millennium BC
Centuries:	4th century BC – 3rd century BC – 2nd century BC
Decades:	310s BC 300s BC 290s BC – 280s BC – 270s BC 260s BC 250s BC
Years:	283 BC 282 BC 281 BC – 280 BC – 279 BC 278 BC 277 BC

280 BC by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments

**280 BC in other calendars**
Gregorian calendar	280 BC
Ab urbe condita	474
Armenian calendar	N/A
Bahá'í calendar	-2123 – -2122
Bengali calendar	-872
Berber calendar	671
Buddhist calendar	265
Burmese calendar	-917
Byzantine calendar	5229 – 5230
Chinese calendar	[[Sexagenary cycle\|]]年 (2357/2417) — to — [[Sexagenary cycle\|]]年 (2358/2418)
Coptic calendar	-563 – -562
Ethiopian calendar	-287 – -286
Hebrew calendar	3481 – 3482
Hindu calendars
- Bikram Samwat	-223 – -222
- Shaka Samvat	N/A
- Kali Yuga	2822 – 2823
Holocene calendar	9721
Iranian calendar	901 BP – 900 BP
Islamic calendar	929 BH – 928 BH
Japanese calendar
Korean calendar	2054
Thai solar calendar	264

Events

Antiochus makes his eldest son, Seleucus, king in the east, but he proves to be incompetent.
Antiochus is compelled to make peace with his father's murderer and King of Macedon, Ptolemy Keraunos, abandoning, for the time being, his plans to control Macedonia and Thrace.
Nicomedes, King of Bithynia, is threatened with an invasion from Antiochus who has already made war upon his father, Zipoites. Antiochus actually invades Bithynia but withdraws again without risking a battle.
Antiochus is unable to bring under his control the Persian dynasties that rule in Cappadocia.
Antiochus is defeated by Egypt's Ptolemy II in the Damascene War.

Pyrrhus makes an alliance with Ptolemy Keraunos, King of Macedon. This allows him to go to southern Italy with his army.
The Achaean League is reformed by twelve towns in the northern Peloponnesus and will later grow to include non-Achaean cities. It has two generals, a federal council with proportional representation of members and an annual assembly of all free citizens. The League achieves a common coinage and foreign policy and the member cities pool their armed forces.
Rhodes, rising in prosperity, becomes head of an Island League and helps to keep the peace and freedom of the Greek islands in the Aegean Sea.
The Colossus of Rhodes is completed by the sculptor Chares of Lindos after twelve years' work. It becomes one of the seven wonders of the ancient world. The Colossus of Rhodes is a giant statue of the Greek god Helios. It stands 70 cubits tall, over 30 metres (100 feet), making it the tallest statue of the ancient world.

Responding to an appeal from Tarentum, King Pyrrhus of Epirus uses his army of over 20,000 men against the Romans. In the Battle of Heraclea he defeats a Roman army led by consul Publius Valerius Laevinus. Pyrrhus's judicious use of his elephants plays a large part in his victory. Several tribes including the Lucani, Bruttii and the Messapians as well as the Greek cities of Crotone and Locri join Pyrrhus.
Roman commander and statesman, Gaius Fabricius Luscinus, is sent to negotiate the ransom and exchange of prisoners. Pyrrhus is so impressed by Fabricius refusing to accept a bribe, that Pyrrhus releases the prisoners without the requirement for a ransom. Following his victory, Pyrrhus advances as far north as Latium.

Aristarchus of Samos uses the size of the Earth's shadow on the Moon to estimate that the Moon's radius is one-third that of the Earth. He proposes for the first time a heliocentric view of the Solar System, but is ignored due to the lack of evidence of the Earth's motion.

Philo of Byzantium, a Greek writer on mechanics (approximate date) (d. c. 220 BC)
Li Si, influential prime minister (or chancellor) of the feudal state and later of the dynasty of Qin (approximate date) (d. 208 BC)

Herophilus, Alexandrian physician who has been an early performer of public dissections on human cadavers; often called the father of anatomy (b. c. 335 BC)
Demetrius of Phaleron (or Demetrius Phalereus), Athenian orator, statesman, and philosopher, who has become prominent at the court of Ptolemy I, enjoying a high reputation as an orator (b. c. 350 BC)