|Ab urbe condita||2057|
|Balinese saka calendar||1225–1226|
|English Regnal year||32 Edw. 1 – 33 Edw. 1|
|Chinese calendar||癸卯年 (Water Rabbit)|
4000 or 3940
— to —
甲辰年 (Wood Dragon)
4001 or 3941
|- Vikram Samvat||1360–1361|
|- Shaka Samvat||1225–1226|
|- Kali Yuga||4404–4405|
|Japanese calendar||Kagen 2|
|Minguo calendar||608 before ROC|
|Thai solar calendar||1846–1847|
1430 or 1049 or 277
— to —
1431 or 1050 or 278
|Wikimedia Commons has media related to 1304.|
- February 9 – Wars of Scottish Independence: John "Red" Comyn, Lord of Badenoch, negotiates a peace with the Kingdom of England.
- July 20 – Fall of Stirling Castle: Edward I of England takes the last rebel stronghold in the Wars of Scottish Independence.
- August 17 – The Battle of Mons-en-Pévèle is fought to a draw, between the French army and the Flemish militias.
- October 24 – Sasa Bey of the Beylik of Menteşe conquers Ephesus from the Eastern Roman Empire, massacring and deporting its native population.
- James II of Aragon reconquers Villena, Spain.
- Holland and Zeeland are occupied by John II, Duke of Brabant and Guy of Dampierre. John II, Count of Hainaut recovers the counties.
- Ala-ud-din Khalji, Sultan of Delhi, conquers Gujarat.
- A peace treaty, signed between the khanates of the Mongol Empire, ends the Mongol civil war.
- The Genoese Benedetto I Zaccaria takes control of Chios Island from the Byzantine Empire, establishing an autonomous lordship there.
- The construction of Ypres Cloth Hall is completed.
- February 25 – Ibn Battuta, Moroccan jurist
- July 20 – Petrarch, Italian poet (d. 1374)
- William de Clinton, 1st Earl of Huntingdon
- Marie of Luxembourg, Queen of France (d. 1324)
- Louis I of Flanders (d. 1346)
- Jayaatu Khan, emperor of the Yuan Dynasty (d. 1332)
- Günther von Schwarzburg, German king (d. 1349)
- March 7 or 8 – Bartolomeo I della Scala, lord of Verona
- May 11 – Mahmud Ghazan, Mongol ruler (b. 1271)
- May 23 – Jehan de Lescurel, French poet and composer
- July 7 – Pope Benedict XI (b. 1240)
- July 17 – Edmund Mortimer, 2nd Baron Wigmore
- August 17 – Emperor Go-Fukakusa of Japan (b. 1243)
- August 22 – John II, Count of Hainaut (b. 1247)
- September – John de Warenne, 6th Earl of Surrey, English soldier
- December 23 – Matilda of Habsburg, duchess regent of Bavaria (b. 1253)
- The Oxford companion to Scottish history. Oxford University Press. p. 334. ISBN 9780199693054.
- Foss, Clive (1979). Ephesus After Antiquity: A Late Antique, Byzantine, and Turkish City. Cambridge, UK: Cambridge University Press. p. 144. ISBN 0521220866.
- Lock, Peter (2013). The Routledge Companion to the Crusades. Routledge. p. 124. ISBN 9781135131371.
- Miller, William (1921). "The Zaccaria of Phocaea and Chios (1275-1329)". Essays on the Latin Orient. Cambridge: Cambridge University Press. pp. 283–298.