Editing 1420 (section)

=== April&ndash;June ===
* [[April 22]] &ndash; A dispute between the County of Nassau-Siegen and the Electorate of Trier over who shall be made count of [[Isenburg-Limburg]] is settled after negotiations.
* [[April 30]] &ndash; [[Great Frisian War]]: In a war that began 70 years earlier in [[1350]] The [[Skieringers]], led by [[:fy:Sikke Douwes Sjaardema|Sikke Sjaarda]], capture the city of [[Bolsward]] (now part of [[Friesland]] in the [[Netherlands]]) from the wealthier [[Fetkeapers]]. The allies of the Fetkeapers, led by [[Focko Ukena]], then react and make a counterattack on May 12 at Palesloot near [[Hindeloopen]].  
* [[May 12]] &ndash; The Venetian Navy and Army, led by Admiral Loredan, begin their assault on the territory of Dalamatia in order to control the Adriatic. By October, the area is under Venetian control.<ref name=Giulino/> 
* [[May 21]] &ndash; [[Treaty of Troyes]]:  With the Burgundian faction dominant in France, King [[Charles VI of France]] acknowledges [[Henry V of England]] as his heir, and as virtual ruler of most of France.<ref>{{cite book|author=Arthur Hassall|title=France, Mediaeval and Modern: A History|url=https://books.google.com/books?id=aSZdAAAAIAAJ|year=1919|publisher=Clarendon Press|isbn=978-0-598-86435-2|page=64}}</ref>
* [[May 23]] &ndash; [[Albert II of Germany|Albert V]], [[Duke of Austria]], issues the [[Vienna Gesera]], a campaign of expulsion or extermination of the 1,500 [[History of the Jews in Austria|Jewish]] residents of [[Vienna]]. Those who are not imprisoned are executed 10 months later, and similar persecutions are carried out in other cities in Austria.<ref>[https://www.jewishvirtuallibrary.org/wiener-gesera Wiener Gesera], ''Jewish Virtual Library''</ref>
* [[May 25]] &ndash;  [[Henry the Navigator]] is appointed Grand Master of the [[Military Order of Christ]].
* [[June 2]] &ndash; [[Catherine of Valois]] marries King [[Henry V of England]].<ref>{{cite book|author=Keith Dockray|title=Henry V|url=https://books.google.com/books?id=ildnAAAAMAAJ|year=2004|publisher=Tempus|isbn=978-0-7524-3046-1|page=185}}</ref>
* [[June 7]] &ndash; Troops of the [[Republic of Venice]] capture [[Udine]] after a long siege, ending the independence of the [[Patriarchal State of Friuli]], run by the [[Patriarch of Aquileia]].
[[File:Adolf Liebscher - Bitva na hoře Vítkově dne 14. července roku 1420.jpg|200px|thumb|Vitkov Hill]]
* [[June 12]] &ndash; The [[Hussites]] of [[Jan Zizka]] defeat the combined forces of the Holy Roman Empire, the Kingdom of Germany, the Duchy of Austria and the Kingdom of Hungary at the [[Battle of Vítkov Hill]].