Editing 1821 (section)

=== April–June ===
* [[March 25]] ([[Julian calendar|O.S.]])/[[April 6]] ([[Gregorian calendar|N.S.]]) – [[Metropolitan bishop]] [[Germanos of Patras]] raises the [[:File:Greek Revolution flag.svg|revolutionary flag of Greece]] at the Monastery of [[Agia Lavra]] (according to oral tradition), symbolically marking the beginning of the [[Greek War of Independence]] against the [[Ottoman Empire]]; later celebrated as Greece's traditional [[Celebration of the Greek Revolution|Independence Day]].
* [[April 10]] ([[Julian calendar|O.S.]])/[[April 22]] ([[Gregorian calendar|N.S.]]) – [[Ecumenical Patriarch]] [[Gregory V of Constantinople]] is blamed by the [[Ottoman Empire|Ottoman]] government for being unable to suppress [[Greek War of Independence|Greek independence]], and is hanged outside the main gate of the Patriarchal Cathedral immediately after the celebration of Pascha.
* [[May 5]]
** Emperor [[Napoleon]] dies in exile on [[Saint Helena]] of stomach cancer.
** The first edition of the ''Manchester Guardian'' newspaper (from 1959 simply ''[[The Guardian]]'') is published in England.<ref>{{Cite news|url=https://www.theguardian.com/gnm-archive/2002/jun/06/1|title=History of the Guardian|date=December 11, 2017|work=The Guardian|access-date=June 19, 2019|language=en-GB|issn=0261-3077}}</ref>
* [[May 8]] – Greek War of Independence: At the [[Battle of Gravia Inn]], a 120-man Greek force led by [[Odysseas Androutsos]] repulses an Ottoman army of 8,000.
* [[May 12]] – Congress of Laibach finally ends having overseen the successful Austrian intervention in Italy. A planned [[Congress of Verona]] in 1822 is agreed as the next meeting. 
* [[June 14]] – [[Egyptian conquest of Sudan (1820–1824)]]: King [[Badi VII]] of [[Sennar (sultanate)|Sennar]] surrenders his throne and realm without a fight to Ismail Pasha, general of the [[Ottoman Empire]], ending the existence of the [[Funj Sultanate]] in Sudan.
* [[June 7]] ([[Julian calendar|O.S.]])/[[June 19]] ([[Gregorian calendar|N.S.]]) – [[Battle of Drăgășani]], Wallachia: The [[Filiki Eteria]] are decisively defeated by the [[Ottoman Empire|Ottomans]].
[[File:BatallaCarabobo01.JPG|200px|thumb|right|June 24: [[Battle of Carabobo]]]]
* [[June 24]] – [[Battle of Carabobo]]: [[Simón Bolívar]] wins Venezuela's [[History of Venezuela#19th century: independence|independence from Spain]].