1338

Events 
 Hundred Years' War: Louis IV, Holy Roman Emperor appoints Edward III of England as a vicar-general of the Holy Roman Empire. Louis supports Edward's claim to the French throne under the terms of the Treaty of Koblenz.
 Philip VI of France besieges Guienne in Southwest France and his navy attacks Portsmouth in England.
 Ashikaga Takauji granted title of Shogun by the emperor of Japan.
 Nicomedia is captured by the Ottoman Empire.

 Births 
 21 January – Charles V of France (died 1380)
 3 February – Joanna of Bourbon (died 1378)
 5 October – Alexios III of Trebizond (died 1390)
 29 November – Lionel of Antwerp, 1st Duke of Clarence (died 1368)

 Unknown dates 
 George de Dunbar, 10th Earl of March (died 1420)
 Niccolò II d'Este (died 1388)
 Thomas de Ros, 5th Baron de Ros (died 1383)
 Margaret de Stafford (died 1396)
 Tvrtko I of Bosnia (died 1391)

 Deaths 
 24 April – Theodore I of Montferrat (born c. 1270)
 5 May – Prince Tsunenaga, son of Japanese Emperor (born 1324)
 July – Muhammad Khan, Persian monarch
 4 August – Thomas of Brotherton, 1st Earl of Norfolk (born 1300)
 22 August – William II of Athens (born 1312)

 Unknown dates 
 Kitabatake Akiie, Japanese governor (born 1318)
 Alfonso Fadrique, Sicilian noble
 Awhadi of Maragheh, Persian poet
 Prince Narinaga, Japanese Shogun (born 1325)
 Marino Sanuto the Elder, Venetian statesman and geographer (born c. 1260)
 John Wishart, Scottish bishop
 Nitta Yoshiaki, Japanese Samurai
 Nitta Yoshisada, Japanese Samurai