Editing 1420 (section)

=== January&ndash;March ===
* [[January 25]] &ndash; The [[Raron affair|civil war in Switzerland]], which had pitted the [[Cantons of Switzerland|cantons]] of [[Canton of Lucerne|Lucerne]], [[Canton of Uri|Uri]] and [[Unterwalden]], supporting rebels in [[Valais]] against the [[Raron family|Baron of Valais]] and against the [[Canton of Bern]], is ended by the signing of a treaty at the neutral town of [[Zug]], after mediation by [[Amadeus VIII, Duke of Savoy]].<ref>{{Cite book |title=The History of Switzerland, for the Swiss People |last=Zschokke |first=Heinrich and Emil |publisher=C. S. Francis & Company |year=1855 |url=https://archive.org/details/historyswitzerl00zschgoog|pages=[https://archive.org/details/historyswitzerl00zschgoog/page/n98 78]–81}}</ref>
* [[February 8]] &ndash; [[Pietro Loredan (admiral)|Admiral Pietro Loredan]] of the Republic of Venice is assigned to carry out the conquest of Dalmatia (now part of Croatia) across the [[Adriatic Sea]].<ref name=Giulino>{{DBI | last = Gulino | first = Giuseppe | title = LOREDAN, Pietro | url = http://www.treccani.it/enciclopedia/pietro-loredan_(Dizionario-Biografico) | volume = 65 | accessdate = 18 March 2017}}</ref>
* [[February 14]] &ndash; [[William Taylor (Lollard)|William Taylor]] is acquitted of charges of heresy in a trial before the [[Archbishop of Canterbury]], [[Henry Chichele]]. Taylor will later be convicted and burned at the stake for heresy in 1423.<ref>{{cite DNB|wstitle=Taylor, William (d.1423)|volume=55}}</ref>
* [[March 1]] &ndash; [[Pope Martin V]] issues the papal bull ''Omnium plasmatoris domini'', calling upon Roman Catholics to unite in a crusade against what he considers heretic Christian sects, including the adherents of [[John Wycliffe]] ([[Lollards]]) and the followers of [[Jan Hus]] (Hussites).<ref>"[https://www.newadvent.org/cathen/07585a.htm Hussites]", in ''The Catholic Encyclopedia''</ref><ref>Šmahel, František, ''Husitská revoluce, 3. Kronika válečných let ''(The Hussite Revolution. 3. Chronicle of the War Years) (Prague: Karolinum, 1996) p.36 (ISBAN 80-7184-075-0)</ref>
* [[March 15]] &ndash; Sigismund, the Holy Roman Emperor, orders the execution of the Hussite Jan Krása, who had led an uprising against the Empire at Wroclaw.
* [[March 17]] &ndash; Ferdinand de Palacios, an envoy of the Pope, publishes the papal bull at Wroclaw, calling for a crusade against the Hussites
* [[March 25]] &ndash; [[Hussite Wars]] After their offer of a surrender is refused, the outnumbered Hussites of [[Bohemia]], led by [[Jan Zizka]], defeat the invading Holy Roman Imperial forces at the [[Battle of Sudoměř]] fought near what is now [[Čejetice]] in the [[Czech Republic]].<ref>[https://web.archive.org/web/20060304001712/http://myweb.tiscali.co.uk/matthaywood/main/Hussite_Battles_and_Significant_events.htm List of Hussite Battles]</ref>[[Frederick II of Brandenburg|Frederick II]]
* [[March 26]] &ndash; [[Frederick I, Elector of Brandenburg]] leads a decisive defeat of the [[Pomerania in the Late Middle Ages|Pomeranian Alliance]] in the battle of [[Angermünde]].<ref>[[Werner Buchholz (German historian)|Werner Buchholz]] et al., ''Pommern'' (Siedler, 1999) {{ISBN|3-88680-780-0}} pp.160-166</ref>