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Hungary's Charles III (Károly Durrazzói) is assassinated at Buda February 17 at age 40 by order of Elizabeth, widow of the late Louis I. He has been king of Naples since 1381, and his death after less than a year as king of Hungary leaves Naples as well as Hungary without a monarch.
The Treaty of Windsor signed May 9 allies England and Portugal by joining Portugal's João I in marriage with Philippa, daughter of John of Gaunt, duke of Lancaster. Much detested in England, the duke leaves for Spain to pursue his claim to the throne of Castile and Léon based upon his marriage in 1371 to Constance of Castile (see 1379), and although his expedition will end in failure he will succeed in having his daughter Catherine married to the child who will become Enrique III of Castile and Léon 4 years hence.
The Battle of Sempach 10 miles northwest of Lucerne July 9 gives the Swiss a victory over an Austrian army, whose commander, Leopold III, dies fighting at age 34 as the cantons struggle to gain independence from Vienna. The 4,000-man Austrian army includes a high proportion of cavalry and several guns. The Swiss have only 1,600 pikemen and halberdiers under the command of cantonal leaders from Lucerne, Uri, Underwalden, and Schwytz, but the Austrians turn tail after 1,800 of them have been killed (Swiss casualties total 200 killed), and the triumph establishes the Swiss as a military force to be reckoned with (see Näfels, 1388).
Jagiello, grand duke of Lithuania, is baptized at Kraków February 15, marries the 12-year-old Jadwiga (Hedwig) February 18, and is crowned king of Poland at Kraków (see 1384). He will be titular head of Poland until 1434 as Wladyslaw II Jagiello, but it is Jadwiga who will control the country until her death in 1399.
Tamerlane sacks the Georgian capital Tiflis and battles with the great khan Toqtamish of the Golden Horde, giving his Muscovite hostage Basil (Vasily) Dmitriyevich an opportunity to escape from the Tatar court and return to Moscow (see 1383; Kars, 1387).




