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This article is about the year 1245.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1210s 1220s 1230s – 1240s – 1250s 1260s 1270s|
|Years:||1242 1243 1244 – 1245 – 1246 1247 1248|
|1245 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1245 in poetry|
|Ab urbe condita||1998|
|Bahá'í calendar||−599 – −598|
|English Regnal year||29 Hen. 3 – 30 Hen. 3|
|Chinese calendar||甲辰年 (Wood Dragon)
3941 or 3881
— to —
乙巳年 (Wood Snake)
3942 or 3882
|- Vikram Samvat||1301–1302|
|- Shaka Samvat||1167–1168|
|- Kali Yuga||4346–4347|
|Japanese calendar||Kangen 3
|Minguo calendar||667 before ROC
|Thai solar calendar||1788|
|Wikimedia Commons has media related to 1245.|
- June 28 – Opening of the First Council of Lyon, in the course of which Frederick II, Holy Roman Emperor, is excommunicated and deposed, and the Seventh Crusade is proclaimed.
- August 1 – The second of two papal bulls refers to the marriage of King Sancho II of Portugal to Mécia Lopes de Haro and decrees the deposition of the king.
- date unknown
- 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.
- The rebuilding of Westminster Abbey is started.
- Pope Innocent IV sends Giovanni da Pian del Carpine to the Mongol court, suggesting (amongst other things) that the Mongols convert to Christianity.
- January 16 – Edmund Crouchback, 1st Earl of Lancaster, son of Henry III of England (d. 1296)
- April 3 – King Philip III of France (d. 1285)
- date unknown – Boniface of Savoy
- August 19 – Ramon Berenguer IV, Count of Provence (b. 1195)
- August 21 – Alexander of Hales, English theologian