1260

The Cathedral of Chartres is dedicated.

Kublai Khan becomes ruler of the Mongol Empire.

Livonia in 1260

Events

October 24 – Saif ad-Din Qutuz, Mamluk sultan of Egypt, is assassinated by Baibars, who seizes power for himself.<ref name=":0a">Template:Cite book</ref><ref>Template:Cite book</ref>
The civil servant and bard longing for lost al-Andalus, Ibn al-Abbar, is burnt at the stake by the Marinid ruler.<ref name=":1a">Template:Cite book</ref>
The Arba'a Rukun Mosque is completed in Mogadishu. The Arba'a Rukun Mosque (Arabic: أربع ركون), also known as Arba Rucun, is a mosque in the medieval district Shangani, Mogadishu, Somalia.<ref>Template:Cite book</ref>

The Toluid Civil War begins between Kublai Khan and Ariq Böke, for the title of Great Khan.<ref name=":2">Template:Cite book</ref>
May 5 – Kublai Khan becomes a claimant to the Mongol Empire, after the death of Möngke Khan.<ref name=":2" />
May 21 – Kublai sends his envoy Hao Jing to negotiate with Song dynasty Chancellor Jia Sidao, after the small force left by Kublai south of the Yangtze River is destroyed, by a Chinese army of the Southern Song dynasty. Chancellor Jia Sidao imprisons the entire embassy of Kublai. This slight will not be forgotten by Kublai, but he is unable to assault the Song, due to the civil war with his rival brother Ariq Böke.Template:Citation needed
September 3 – Battle of Ain Jalut in Galilee: The Mamluks defeat the Mongols, marking their first decisive defeat, and the point of maximum expansion of the Mongol Empire. Isa ibn Muhanna is appointed amir al-ʿarab under the Mamluks.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>
The Chinese era Jingding begins and ends in the Southern Song dynasty of China.<ref>Template:Cite book</ref>
The Japanese Shōgen era ends, and the Bun'ō era begins.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>

July 12 – Battle of Kressenbrunn: King Ottokar II of Bohemia captures Styria from King Béla IV of Hungary.<ref>Template:Cite book</ref>
July 13 – Livonian Crusade: The Baltic Samogitians and Curonians of the Grand Duchy of Lithuania decisively defeat the Livonian Order in the Battle of Durbe. This leads the Estonians of Saaremaa Island to once again rebel against the Livonian Order.<ref>Template:Cite book</ref>
September 4 – Battle of Montaperti: The Sienese Ghibellines, supported by the forces of King Manfred of Sicily, defeat the Florentine Guelphs.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>
September 20 – Second of the two major Prussian uprisings by the Old Prussian tribe of Balts against the Teutonic Order begins.
The Duchy of Saxony is divided into Saxony-Lauenberg and Saxony-Wittenberg, marking the end of the first Saxon state.<ref>Template:Cite book</ref>
War breaks out in the Valais (in modern-day Switzerland), as the Bishopry of Sion defends against an invasion by the County of Savoy.Template:Citation needed
Croatia is divided into two sub-regions ruled by ban: the Croatian region on the south and Slavonian region on the north, by King Béla IV of Hungary.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>

October 24 – The Cathedral of Chartres is dedicated in the presence of King Louis IX of France (the cathedral is now a UNESCO World Heritage Site).<ref>Template:Cite book</ref>
Jacobus de Voragine compiles his work, the Golden Legend, a late medieval best-seller.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>
The mosaic Christ between the Virgin and St Minias is made on the facade of Florence's Basilica di San Miniato al Monte.<ref>Template:Cite book</ref>
German musical theorist Franco of Cologne publishes Ars Cantus Mensurabilis, in which he advances a new theory of musical notation, in which the length of a musical note is denoted by the shape of that note, a system still used today.<ref>Template:Cite book</ref><ref>Template:Cite book</ref>
Construction begins on the Dunkeld Cathedral in Perthshire, Scotland.<ref>Template:Cite book</ref>
Construction begins on the cathedrals at Meißen and Schwerin.<ref>Template:Cite book</ref>
Nicola Pisano sculpts the pulpit in the Pisa Baptistery.<ref>Template:Cite book</ref>

The newly formed Sukhothai Kingdom of Thailand adopts Theravada Buddhism.<ref>Template:Cite book</ref>
The advent of the Age of the Holy Spirit predicted by Joachim of Fiore, according to his interpretation of the Book of Revelation, chapter 6.<ref>Template:Cite book</ref>