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This article is about the year 1455.
|Centuries:||14th century – 15th century – 16th century|
|Decades:||1420s 1430s 1440s – 1450s – 1460s 1470s 1480s|
|Years:||1452 1453 1454 – 1455 – 1456 1457 1458|
|1455 by topic|
|Arts and science|
|Architecture - Art|
|State leaders - Sovereign states|
|Birth and death categories|
|Births - Deaths|
|Establishments and disestablishments categories|
|Establishments - Disestablishments|
|Art and literature|
|1455 in poetry|
|Ab urbe condita||2208|
|Bahá'í calendar||−389 – −388|
|English Regnal year||33 Hen. 6 – 34 Hen. 6|
|Chinese calendar||甲戌年 (Wood Dog)
4151 or 4091
— to —
乙亥年 (Wood Pig)
4152 or 4092
|- Vikram Samvat||1511–1512|
|- Shaka Samvat||1377–1378|
|- Kali Yuga||4556–4557|
|Japanese calendar||Kyōtoku 4 / Kōshō 1
|Minguo calendar||457 before ROC
|Thai solar calendar||1998|
|Wikimedia Commons has media related to 1455.|
- January 8 – Pope Nicholas V publishes Romanus Pontifex, an encyclical addressed to King Afonso V of Portugal, which sanctions the conquest of non-Christian lands, and the reduction of native non-Christian populations to 'perpetual slavery,' in direct contradiction to the 1537 bull Sublimus Dei of Pope Paul III, which forbade the enslavement of non-Christians.
- February 23 – The Gutenberg Bible is the first book printed with movable type.
- April 8 – Pope Calixtus III succeeds Pope Nicholas V as the 209th pope.
- Spring – The Wars of the Roses begin.
- May 1 – Battle of Arkinholm: Forces loyal to King James II of Scotland defeat the supporters of Earl of Douglas.
- May 22 – First Battle of St Albans: Richard, Duke of York, defeats and captures King Henry VI of England.
- July – Siege of Berat.
- February 2 – King John of Denmark, Norway, and Sweden (d. 1513)
- March 3 – King John II of Portugal (d. 1495)
- March 15 – Pietro Accolti, Italian Catholic cardinal (d. 1532)
- August 2 – John Cicero, Elector of Brandenburg (d. 1499)
- date unknown
- February 18 – Fra Angelico, Italian painter (b. 1395)
- March 24 – Pope Nicholas V (b. 1397)
- April 1 – Zbigniew Oleśnicki, Polish cardinal and statesman (b. 1389)
- May 1 – Archibald Douglas, Earl of Moray (in battle)
- May 22 (killed at the First Battle of St Albans)
- September 3 – Alonso Tostado, Spanish Catholic bishop
- October 22 – Johannes Brassart, Flemish composer
- December 1 – Lorenzo Ghiberti, Italian sculptor and metal smith (b. 1378)
- December 2 – Isabel of Coimbra, queen of Portugal (b. 1432)