284 BC

Millennium:	1st millennium BC
Centuries:	4th century BC 3rd century BC 2nd century BC
Decades:	300s BC 290s BC 280s BC 270s BC 260s BC
Years:	287 BC 286 BC 285 BC 284 BC 283 BC 282 BC 281 BC

284 BC in various calendars

Gregorian calendar	284 BC CCLXXXIV BC
Ab urbe condita	470
Ancient Egypt era	XXXIII dynasty, 40
- Pharaoh	Ptolemy I Soter, 40
Ancient Greek era	124th Olympiad (victor)¹
Assyrian calendar	4467
Balinese saka calendar	N/A
Bengali calendar	−876
Berber calendar	667
Buddhist calendar	261
Burmese calendar	−921
Byzantine calendar	5225–5226
Chinese calendar	丙子年 (Fire Rat) 2414 or 2207     — to — 丁丑年 (Fire Ox) 2415 or 2208
Coptic calendar	−567 – −566
Discordian calendar	883
Ethiopian calendar	−291 – −290
Hebrew calendar	3477–3478
Hindu calendars
- Vikram Samvat	−227 – −226
- Shaka Samvat	N/A
- Kali Yuga	2817–2818
Holocene calendar	9717
Iranian calendar	905 BP – 904 BP
Islamic calendar	933 BH – 932 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2050
Minguo calendar	2195 before ROC 民前2195年
Nanakshahi calendar	−1751
Seleucid era	28/29 AG
Thai solar calendar	259–260
Tibetan calendar	阳火鼠年 (male Fire-Rat) −157 or −538 or −1310     — to — 阴火牛年 (female Fire-Ox) −156 or −537 or −1309

Year 284 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Tucca and Denter/Dentatus (or, less frequently, year 470 Ab urbe condita). The denomination 284 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

By place

Roman Republic

• The Gallic tribe called the Senones, who have settled on the Adriatic coast north of Picenum, attack Arretium in Etruria. While attempting to relieve this allied city, the Romans under the command of Lucius Caecilius Metellus Denter suffer a costly defeat in the Battle of Arretium. Aroused by this disaster, a Roman army under Manius Curius Dentatus invades the Senones' territory, defeating them and driving them out of the Italian peninsula.

Greece

• Pyrrhus of Epirus is driven out of Macedonia and back into Epirus by Lysimachus.

Asia Minor

• Ptolemy I's eldest (legitimate) son, Ptolemy Keraunos, whose mother, Eurydice, the daughter of Antipater, had been repudiated by the new King Ptolemy II, flees Egypt to the court of Lysimachus, the king of Thrace, Macedon and Asia Minor.
• Lysimachus' wife, Arsinoe, being keen to gain the succession to the kingdom of Thrace for her sons in preference to Agathocles (the eldest son of Lysimachus), intrigues against him with the help of her brother Ptolemy Keraunos. They accuse him of conspiring with Seleucus to seize the throne, and Agathocles is put to death. This atrocious deed by Lysimachus and his family arouses great indignation. Many of the cities in Asia Minor revolt and some of his most trusted friends desert him.
• Agathocles' widow Lysandra flees with their children and with Alexander, Agathocles' brother, to the court of Seleucus, who at once invades Lysimachus' territory in Asia Minor.

Deaths

• Agathocles, son of King Lysimachus of Thrace
• Ardvates, governor and later ruler of Armenia who founds a dynasty that will rule until 211 BC
• Lucius Caecilius Metellus Denter, Roman consul and general (killed in the Battle of Arretium) (b. c. 320 BC)