1334

Year 1334 (MCCCXXXIV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

January–December

 * July 18 – The bishop of Florence blesses the first foundational stone laid for the new campanile (bell tower) of the Florence Cathedral (the tower was designed by the artist Giotto di Bondone).
 * December 30 – Pope Benedict XII succeeds Pope John XXII, as the 197th pope.

Date unknown

 * Autumn – Battle of Adramyttion: A Christian league defeats the fleet of the Turkish Beylik of Karasi.

Births

 * January 4 – Amadeus VI of Savoy (d. 1383)
 * January 13 – King Henry II of Castile (d. 1379)
 * May 25 – Emperor Sukō (d. 1398)
 * August 30 – King Pedro of Castile (d. 1369)
 * date unknown
 * King James I of Cyprus (d. 1398)
 * Margaret Graham, Countess of Menteith, Scottish noble (d. c. 1380)
 * Hayam Wuruk, Javanese ruler (d. 1389)

Deaths

 * January 17 – John of Brittany, Earl of Richmond (b. c. 1266)
 * December 4 – Pope John XXII (b. 1249)
 * date unknown – Sheikh Safi-ad-din Ardabili of Persia (b. 1251)
 * Isabella de Vesci, politically active French noblewoman (b. 1260s)