Editing 1438 (section)

=== April&ndash;June ===
* [[April 14]] – The [[County of Holland]] declares war on several cities of the [[Hanseatic League]], triggering the [[Dutch–Hanseatic War]].<ref name=vaughan>{{cite book |last= Vaughan |date=2004 |first=Richard |title=Philip the Good |edition=reprinted new |url={{google books|H7VFJAK8LSUC|plainurl=yes}} |publisher=Boydell Press |isbn=978-0-85115-917-1 |page=92}}</ref>
* [[May 6]] &ndash; [[Albert II of Germany|Albert]] becomes [[List of Bohemian monarchs|King of Bohemia]].
* [[May 19]] &ndash; [[René of Anjou]], son of the late [[Louis II of Anjou|King Louis II of Valois-Anjou]] arrives in the [[Kingdom of Naples]] to take the vacant throne, reaching the Italian city ahead of King [[Alfonso V of Aragon]], who also wanted the throne.<ref>{{citation |last=Kekewich |first=Margaret L. |title=The Good King: Rene of Anjou and Fifteenth Century Europe |publisher=Palgrave Macmillan |page=32 |year=2008 }}</ref> Alfonso makes plans to lay siege to the city of [[Naples]].
* [[June 7]] &ndash; Upon the death of [[Barsbay|Al-Ashraf Sayf ad-Dīn Barsbāy]], the [[Mamluk]] [[List of Mamluk sultans|Sultan of Egypt and Syria]], his 14 year old son [[Al-Aziz Jamal al-Din Yusuf]] temporarily becomes the new monarch, under the guardianship of the regent [[Sayf al-Din Jaqmaq]], [[List of rulers of Damascus#Mamluk na'ibs|Na'ib of Damascus]].<ref name=Margoliouth>{{Cite EB1911|wstitle= Egypt/3 History |volume= 9 |last= Margoliouth |first= David Samuel |author-link= David Samuel Margoliouth |page=102 }}</ref>
* [[June 29]] &ndash; The coronation of [[Albert II of Habsburg|King Albrecht II. Habsburský of Bohemia]] takes place in [[Prague]].