Year 1300 (MCCC) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar.
February 22 – The Jubilee of Pope Boniface VIII is celebrated. It is at this celebration that Giovanni Villani decides to write his universal history of Florence, the Cronica.
June 15 – The city of Bilbao receives a royal foundation charter.
Money from Florence, Italy becomes the first international currency.
Philip IV of France begins his attempt to annex Flanders.
Wenceslas II of Bohemia becomes King of Poland.
A census in Imperial China finds that it has roughly 60 million inhabitants.
The Tuareg establish a state centered on Agadez.
Amsterdam is officially declared a city.
Jacob ben Machir is appointed dean of the medical school at Montpellier, France.
Aztec culture starts in Mesoamerica (approximate date).
The Dulcinian sect begins when Gherardo Segarelli, founder of the Apostolic Brethren, is burned at the stake in Parma during a brutal repression of the Apostolics
June 1 – Thomas of Brotherton, 1st Earl of Norfolk, son of Edward I of England (d. 1338)
September 27 – Adolf, Count Palatine of the Rhine (d. 1327)
date unknown
John III, Duke of Brabant (d. 1355)
Jean Buridan, French philosopher and religious skeptic (d. 1358)
Khutughtu Khan, Emperor Mingzong of Yuan, emperor of the Yuan Dynasty (d. 1329)
Chihab Addine Abul-Abbas Ahmad ben Fadhl Al-Umari, Arab historian (d. 1384)
Robert, Count of Burgundy (d. 1315)
probable
Dionigi di Borgo San Sepolcro, Augustinian monk (d. 1342)
Geoffroi de Charny, French knight and chivalric writer (d. 1356)
Richard FitzRalph, Archbishop of Armagh (d. 1360)
Taddeo Gaddi, Italian painter and architect (d. 1366)
Ibn Kathir, Islamic scholar (d. 1373)
Laurence Minot, English poet (d. 1352)
John of Winterthur, Swiss historian
February 19 – Munio of Zamora, General of the Dominican Order
July 18 – Gerard Segarelli, founder of the Apostolic Brethren (burned at stake)
September – Edmund, 2nd Earl of Cornwall (approximate date; b. 1249)
December – Jean de Montfort-Castres, Count of Squillace
date unknown
Guido Cavalcanti, Italian poet (b. 1250)
Tsar Chaka, Mongol ruler of Bulgaria
Tran Hung Dao, Vietnamese general
Jacob van Maerlant, Flemish poet
William of Nangis, French chronicler
March 25 (April 2 in the Proleptic Gregorian calendar, Good Friday) – The date of Dante's journey as the protagonist in his own epic poem, The Divine Comedy. Beginning with the Inferno, he made many cultural references to his time.
Till Eulenspiegel is said to have been born in this year.
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