90 BC

Millennium:	1st millennium BC
Centuries:	2nd century BC 1st century BC 1st century
Decades:	110s BC 100s BC 90s BC 80s BC 70s BC
Years:	93 BC 92 BC 91 BC 90 BC 89 BC 88 BC 87 BC

90 BC in various calendars

Gregorian calendar	90 BC XC BC
Ab urbe condita	664
Ancient Egypt era	XXXIII dynasty, 234
- Pharaoh	Ptolemy X Alexander, 18
Ancient Greek era	172nd Olympiad, year 3
Assyrian calendar	4661
Balinese saka calendar	N/A
Bengali calendar	−682
Berber calendar	861
Buddhist calendar	455
Burmese calendar	−727
Byzantine calendar	5419–5420
Chinese calendar	庚寅年 (Metal Tiger) 2608 or 2401     — to — 辛卯年 (Metal Rabbit) 2609 or 2402
Coptic calendar	−373 – −372
Discordian calendar	1077
Ethiopian calendar	−97 – −96
Hebrew calendar	3671–3672
Hindu calendars
- Vikram Samvat	−33 – −32
- Shaka Samvat	N/A
- Kali Yuga	3011–3012
Holocene calendar	9911
Iranian calendar	711 BP – 710 BP
Islamic calendar	733 BH – 732 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2244
Minguo calendar	2001 before ROC 民前2001年
Nanakshahi calendar	−1557
Seleucid era	222/223 AG
Thai solar calendar	453–454
Tibetan calendar	阳金虎年 (male Iron-Tiger) 37 or −344 or −1116     — to — 阴金兔年 (female Iron-Rabbit) 38 or −343 or −1115

Year 90 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Caesar and Lupus (or, less frequently, year 664 Ab urbe condita) and the Third Year of Zhenghe. The denomination 90 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

• Consuls: Lucius Julius Caesar and Publius Rutilius Lupus.
• Social War continues: Pompeius Strabo and Gaius Marius distinguish themselves.
• The Etruscans are granted Roman citizenship.
• Corfinium in south-central Italy is the center of a rebellion against Rome.
• The Lex Iulia grants citizenship to all Italians who did not oppose Rome during the Social War.
• Cicero starts to serve in the Roman army.

Asia Minor

• Nicomedes IV of Bithynia is defeated in battle by a coalition of Nicomedes' brother Socrates, and Mithridates VI of Pontus. Nicomedes flees to Rome.

China

• The Xiongnu invade the Prefectures of Wuyuan and Jiuquan and kill the commandants of both Prefectures.
• Emperor Wu of Han sends three armies against the Xiongnu under General-in-Chief Li Guangli, Ma Tong and Shang Qiucheng, marching from Wuyuan, Jiuqian and Xihe respectively. An army of Central Asian vassals of Han, under Cheng Mian, captures the king of the vassal state of Jushi, who is suspected of treachery. The Xiongnu General-in-Chief and the former Han general Li Ling fight indecisively against Shang's army.
• Li Guangli and his in-law Prime Minister Liu Qumao seek to recommend Liu Bo, Li Guangli's nephew, as the new Crown Prince, and while Li Guangli is on campaign, Liu Qumao and his wife are executed and Li Guangli's wife imprisoned, having been charged with cursing the emperor and seeking to replace him with Liu Bo.
• Wishing to please the emperor, Li Guangli and his 70,000 men penetrate as far as the Selenga River. A detachment crosses the river and defeats an army of 20,000 under the Xiongnu Left General-in-Chief, who is killed. However, Li Guangli is then defeated by Hulugu Chanyu's army of 50,000 in the Khangai Mountains and surrenders. Li Guangli marries Hulugu's daughter, and Emperor Wu exterminates Li's clan.

Births

• Aulus Hirtius, Roman politician and historian (d. 43 BC)
• Diodorus Siculus, Greek historian (approximate date)
• Pasherienptah III, Egyptian high priest (d. 41 BC)

Deaths

• Antiochus X Eusebes, Seleucid king (approximate date)
• Dionysios Trax, Greek grammarian (b. 170 BC)
• Li Yannian, Chinese musician (executed by Wu of Han)
• Pharnajom, king of Iberia (modern Georgia)