1383, Spring
Poland and Lithuania
Sigismund of Luxembourg married Mary, and they were crowned – as king and queen of Poland.
Marriage
Many guests came to the wedding: Wenceslaus, King of the Romans and the brother of Sigismund; William the Courteous, the oldest son of Duke Leopold of Austria, fiancé of Jadwiga, the sister of Mary; Conrad Zöllner von Rothenstein, the Grand Master of the Teutonic Order; Janusz I of Warsaw and many others.
Jogaila also came to the wedding. He had many goals. Jogaila signed the Treaty with Janusz I of Warsaw [1], signed agreements with Louis and Sigismund, and – it was the main goal – Jogaila was baptized by Wenceslaus, King of the Romans. Jogaila made the first act of the Treaty of Dubysa, but it was a prestige baptization, by the most power man in Europe.
Moscow and the Golden Horde
Khan Tokhtamysh got to know about the negotiations between Moscow and Lithuania. He was angry and ordered to send the son of Dmitry to the Horde. On 23 April Vasiliy, the oldest son, was sent to Tokhtamysh. [2]
Hungary and Naples
A large Hungarian army was sent to Naples to help Charles III of Naples. [3]
Charles III
A French army became less after death of Amadeus VI of Savoy, and Charles attacked Louis I of Anjou. Charles was defeated and captured. [4] Lois I entered in Naples and imprisoned wife and son of Charles.
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[1] – Janusz I took advantage of a civil war in Lithuania in 1382 to capture the towns of Podlachia and Drohiczyn, claiming them as a part of the dowry of his wife Danutė (a daughter of Kęstutis), with he had married around 1371/73. In OTL Jogaila recovered this lands, but in TTL he was not be able to attack the ally of Poland, Hungary and Teutonic Order.
[2] – OTL.
[3] – a short history of the war: On 11 May 1380 Pope Urban VI declared Joanna I of Naples a heretic and her Kingdom, a papal fief, to be forfeit and bestowed it upon Charles III. In exchange for his help, Joanna adopted Louis I of Anjou as her heir on 29 June 1380. Charles III invaded Naples in November 1380 at the head of an army mainly composed by Hungarians, entered in Naples on 16 July 1381 and captured Joanna on 25 August. Louis I of Anjou went to Avignon at the head of a powerful army on 31 May 1382 in order to rescue Joanna. He passed through Turin and Milan. Towards the beginning of September, he was in Amatrice, near Rome. Charles of Durazzo killed Joanna on 27 July. Louis's expedition counted to some 40,000 troops, including those of Amadeus VI of Savoy, and had the financial support of Antipope Clement VII and Bernabò Visconti of Milan. Charles, who counted on the mercenary companies under John Hawkwood and Bartolomeo d'Alviano, for a total of some 14,000 men, was able to divert the French from Naples to other regions of the kingdom and to harass them with guerrilla tactics. Amadeus fell ill and died in Molise on 1 March 1383, and his troops abandoned the field.
[4] – as far as I know, Charles several times attacked Louis in small battles and was defeated every time. Louis was a very good commander, and only Hawkwood was able to defeat him. But when a large Hungarian army came to Charles, Hawkwood lost his position, and new Hungarian commanders were not so good.