631 BC

Millennium:	1st millennium BC
Centuries:	8th century BC 7th century BC 6th century BC
Decades:	650s BC 640s BC 630s BC 620s BC 610s BC
Years:	634 BC 633 BC 632 BC 631 BC 630 BC 629 BC 628 BC

631 BC in various calendars

Gregorian calendar	631 BC DCXXXI BC
Ab urbe condita	123
Ancient Egypt era	XXVI dynasty, 34
- Pharaoh	Psamtik I, 34
Ancient Greek era	37th Olympiad, year 2
Assyrian calendar	4120
Balinese saka calendar	N/A
Bengali calendar	−1223
Berber calendar	320
Buddhist calendar	−86
Burmese calendar	−1268
Byzantine calendar	4878–4879
Chinese calendar	己丑年 (Earth Ox) 2067 or 1860     — to — 庚寅年 (Metal Tiger) 2068 or 1861
Coptic calendar	−914 – −913
Discordian calendar	536
Ethiopian calendar	−638 – −637
Hebrew calendar	3130–3131
Hindu calendars
- Vikram Samvat	−574 – −573
- Shaka Samvat	N/A
- Kali Yuga	2470–2471
Holocene calendar	9370
Iranian calendar	1252 BP – 1251 BP
Islamic calendar	1290 BH – 1289 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1703
Minguo calendar	2542 before ROC 民前2542年
Nanakshahi calendar	−2098
Thai solar calendar	−88 – −87
Tibetan calendar	阴土牛年 (female Earth-Ox) −504 or −885 or −1657     — to — 阳金虎年 (male Iron-Tiger) −503 or −884 or −1656

The year 631 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 123 Ab urbe condita . The denomination 631 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

• Cyrene, a Greek colony in present-day Libya, North Africa, is founded (approximate date).
• Sadyattes becomes king of Lydia.