|Ab urbe condita||1973|
|Balinese saka calendar||1141–1142|
|English Regnal year||4 Hen. 3 – 5 Hen. 3|
|Chinese calendar||己卯年 (Earth Rabbit)|
3916 or 3856
— to —
庚辰年 (Metal Dragon)
3917 or 3857
|- Vikram Samvat||1276–1277|
|- Shaka Samvat||1141–1142|
|- Kali Yuga||4320–4321|
|Japanese calendar||Jōkyū 2|
|Minguo calendar||692 before ROC|
|Thai solar calendar||1762–1763|
1346 or 965 or 193
— to —
1347 or 966 or 194
|Wikimedia Commons has media related to 1220.|
- May 26 – German Frederick II, Holy Roman Emperor, grants bishops sovereign rights.
- May – St. Francis of Assisi resigns from the leadership of the Franciscan Order.
- August 8 – Livonian Crusade: Estonians defeat the invading Swedes, in the Battle of Lihula.
- November 22 – Frederick II is crowned Holy Roman Emperor, by Pope Honorius III.
- The Mongols first invade the Khwarazmian Empire; Bukhara and Samarkand are taken.
- The Dominican Order is approved by Pope Honorius III.
- Conrad of Masovia drives out the heathen Prussians, from the Masovian territory of Chelmno Land.
- Trial by ordeal is abolished in England.
- The German Hohenstaufen dynasty, which had ruled Sicily since 1194, adopts Palermo as its principal seat.
- Dordrecht receives city rights, making it the oldest city in the present-day Holland area.
- Ljubljana receives its town rights.
- The Islamic lands of Central Asia are overrun by the armies of the Mongol invader Genghis Khan (ca. 1155–1227), who lays waste to many civilizations, and creates an empire that stretches from China to the Caspian Sea.
- The Thai Kingdom of Sukhothai is established.
- Saint Benedict of Nursia is canonized by the Roman Catholic Church.
- Gothic architecture becomes increasingly popular in Europe.
- The rebuilding of the Cathedral of Chartres, which had been destroyed by a fire in 1194, is completed.
- The rebuilding of Amiens Cathedral begins.
- The rebuilding of York Minster begins.
- The building of the Salisbury Cathedral begins.
- The rebuilding of the city of London begins.
- April 1 – Emperor Go-Saga of Japan (d. 1272)
- November 11 – Alphonse of Toulouse, son of Louis VIII of France (d. 1271)
- Alexander Nevsky, Grand Prince of Novgorod and Vladimir
- Joan, Countess of Toulouse, (d. 1271)
- Przemysł I of Poland (d. 1257)
- Thomas Ercildoun, Scottish minstrel (d. 1297)
- Walter de Burgh, 1st Earl of Ulster (d. 1271)
- Yaroslav of Russia, Grand Duke of Vladimir
- February 17 – Theobald I, Duke of Lorraine
- April 15 – Adolf of Altena, Archbishop of Cologne
- May 8 – Richeza of Denmark, queen consort of Sweden (b. c. 1180)
- June 1 – Henry de Bohun, 1st Earl of Hereford (b. 1176)
- November 3 – Urraca of Castile, Queen of Portugal, spouse of King Afonso II of Portugal (b. 1186)
- Michael Choniates, Byzantine writer and ecclesiastic
- Farid od-Din Mohammad ebn Ebrahim 'Attar, Persian mystical poet
- Saxo Grammaticus, Danish historian (b. 1150)
- Mestwin I of Pomerania