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1245 in various calendars
Gregorian calendar	1245; MCCXLV
Ab urbe condita	1998
Armenian calendar	694; ԹՎ ՈՂԴ
Assyrian calendar	5995
Balinese saka calendar	1166–1167
Bengali calendar	652
Berber calendar	2195
English Regnal year	29 Hen. 3 – 30 Hen. 3
Buddhist calendar	1789
Burmese calendar	607
Byzantine calendar	6753–6754
Chinese calendar	甲辰年 (Wood Dragon); 3942 or 3735; — to —; 乙巳年 (Wood Snake); 3943 or 3736
Coptic calendar	961–962
Discordian calendar	2411
Ethiopian calendar	1237–1238
Hebrew calendar	5005–5006
Hindu calendars
- Vikram Samvat	1301–1302
- Shaka Samvat	1166–1167
- Kali Yuga	4345–4346
Holocene calendar	11245
Igbo calendar	245–246
Iranian calendar	623–624
Islamic calendar	642–643
Japanese calendar	Kangen 3; (寛元３年)
Javanese calendar	1154–1155
Julian calendar	1245; MCCXLV
Korean calendar	3578
Minguo calendar	667 before ROC; 民前667年
Nanakshahi calendar	−223
Thai solar calendar	1787–1788
Tibetan calendar	阳木龙年; (male Wood-Dragon); 1371 or 990 or 218; — to —; 阴木蛇年; (female Wood-Snake); 1372 or 991 or 219

Millennium:	2nd millennium
Centuries:	12th century; 13th century ; 14th century;
Decades:	1220s; 1230s; 1240s ; 1250s; 1260s;
Years:	1242; 1243; 1244; 1245 ; 1246; 1247; 1248;

Year 1245 (MCCXLV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.

Events

Winter – Siege of Jaén: Castilian forces under King Ferdinand III (the Saint) besiege the Moorish-held city of Jaén. During the siege Moorish knights sally out and manage to capture a Castilian supply caravan. Meanwhile, Ferdinand tries to launch attacks on the various city gates, but all are ineffective.
In witness of the toll taken by war and fiscal pressure in the Kingdom of Castile, the region of Segovia is described this year as depopulated and sterile.^[1]

King Henry III starts the work of rebuilding Westminster Abbey, as a tribute to Edward the Confessor.

April – Egyptian forces under As-Salih Ayyub besiege the city of Damascus. After six months, As-Salih Ismail, ruler of Damascus, surrenders to Ayyub in return for a vassal-principality, consisting of Baalbek and the Hauran. Ayyub is awarded the title of sultan by Caliph Al-Musta'sim in Baghdad.^[2]

February 21 – Thomas, bishop of Turku (modern Finland), is granted resignation by Pope Innocent IV. He admits to committing several felonies, such as torturing and forging a papal letter.
April 16 – Innocent IV sends Giovanni da Pian del Carpine (accompanied by Stephen of Bohemia) to the Mongol court at Karakorum, suggesting that the Mongols convert to Christianity.^[3]
June 28 – First Council of Lyon: In a general church council held at Lyon, Innocent IV declares Emperor Frederick II excommunicated and deposed. He proclaims the Seventh Crusade.^[4]

^ Linehan, Peter (1999). "Chapter 21: Castile, Portugal and Navarre". In Abulafia, David (ed.). The New Cambridge Medieval History c.1198-c.1300. Cambridge: Cambridge University Press. pp. 668–699 [670]. ISBN 0-521-36289-X.
^ Steven Runciman (1952). A History of The Crusades. Vol III: The Kingdom of Acre, pp. 190–191. ISBN 978-0241-29877-0.
^ Yule, Henry; Beazley, Charles Raymond (1911). "Carpini, Joannes de Piano". In Chisholm, Hugh (ed.). Encyclopedia Britannica. Vol 5 (11th ed.). Cambridge University Press. pp. 397–399.
^ Hywel Williams (2005). Cassell's Chronology of World History, p. 141. ISBN 0-304-35730-8.