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931 in various calendars
Gregorian calendar	931; CMXXXI
Ab urbe condita	1684
Armenian calendar	380; ԹՎ ՅՁ
Assyrian calendar	5681
Balinese saka calendar	852–853
Bengali calendar	338
Berber calendar	1881
Buddhist calendar	1475
Burmese calendar	293
Byzantine calendar	6439–6440
Chinese calendar	庚寅年 (Metal Tiger); 3628 or 3421; — to —; 辛卯年 (Metal Rabbit); 3629 or 3422
Coptic calendar	647–648
Discordian calendar	2097
Ethiopian calendar	923–924
Hebrew calendar	4691–4692
Hindu calendars
- Vikram Samvat	987–988
- Shaka Samvat	852–853
- Kali Yuga	4031–4032
Holocene calendar	10931
Iranian calendar	309–310
Islamic calendar	318–319
Japanese calendar	Enchō 9 / Jōhei 1; (承平元年)
Javanese calendar	830–831
Julian calendar	931; CMXXXI
Korean calendar	3264
Minguo calendar	981 before ROC; 民前981年
Nanakshahi calendar	−537
Seleucid era	1242/1243 AG
Thai solar calendar	1473–1474
Tibetan calendar	阳金虎年; (male Iron-Tiger); 1057 or 676 or −96; — to —; 阴金兔年; (female Iron-Rabbit); 1058 or 677 or −95

Millennium:	1st millennium
Centuries:	9th century; 10th century ; 11th century;
Decades:	910s; 920s; 930s ; 940s; 950s;
Years:	928; 929; 930; 931 ; 932; 933; 934;

Year 931 (CMXXXI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

Events

The Ummayad Caliphate of Córdoba invades and conquers the city of Ceuta, which was ruled by the Berber dynasty Banu Isam.

Spring – Hugh of Provence, king of Italy, cedes Lower Burgundy to Rudolph II, in return for Rudolf's renunciation of all claims to the Italian crown. He receives the imperial crown, and induces the Italian nobility to recognize his son Lothair II as the co-ruler of Lombardia (Regnum Italiae).^[1]
King Harald Fairhair of Norway dies after a 59-year reign as the Scandinavian nation's first ruler. He divides the kingdom among his many sons (about 25 years ago) to bring peace. Unable to travel through the country - and perform his royal duties, Harald hands over power to his favorite son Eric Bloodaxe, who allegedly kills at least two of his brothers to gain the Norwegian throne that he will hold (approximate date).
Rollo, duke of Normandy, dies at Rouen after an 11-year reign. He is the first leader of the Viking settlers to establish an independent dukedom (a vassal of the West Frankish Kingdom). His eldest son, William I Longsword, becomes the second ruler of Normandy (approximate date).
Ramiro II forces the abdication of his brother Alfonso IV and becomes king of León (Northern Spain). He has Alfonso and Fruela's three sons blinded in order to make them incapable of ruling.^[2]
Ramiro II expands the border eastwards (nearly to the Pyrenees) and captures Burgos and the surrounding land. This land would soon be known as the County of Castile (approximate date).

King Morgan Hen of Glywysing and Gwent (Wales) submits to the overlordship of King Æthelstan, and attends his court with Kings Hywel Dda of Deheubarth and Idwal Foel of Gwynedd.

Emir Mardavij ibn Ziyar defeats and kills his rival Asfar ibn Shiruya. He conquers in rapid succession the Abbasid cities of Hamadan, Dinavar, and Kashan, and finally the entire region of Isfahan, which becomes his capital. Mardavij appoints his brother Vushmgir as the governor of Amol (modern Iran).

Nómina Leonesa, an account of the kings of Asturias and León, is published (approximate date).

March – Pope Stephen VII dies after a three-year reign. He is succeeded by John XI (at the age of 20) as the 125th pope of the Catholic Church. His mother Marozia is the powerful senatrix and patricia of Rome.

^ [1]. Italian History - Timeline Lombard Leagues Board, p. 11.
^ Collins, Roger (1983). Early Medieval Spain. New York: St. Martin's Press. p. 241. ISBN 0-312-22464-8.