Editing 1823 (section)

===April–June===
* [[April 7]] – French forces, the "[[Hundred Thousand Sons of Saint Louis]]", cross the Spanish border at the [[Bidasoa River]]
* [[April 10]] – [[Siege of Pamplona (1823)|Siege of Pamplona]] begins in [[Navarre]] as French troops besiege the city's garrison
* [[April 13]] – [[Franz Liszt]], 11, gives a concert in Vienna, after which he is personally congratulated by [[Ludwig van Beethoven]].<ref>According to Gustav Schilling.</ref>
* [[May 5]] – Emperor [[Pedro I of Brazil]] inaugurates [[Brazil]]'s first ''Assembleia Geral'', with 50 Senators and 102 Deputies.<ref>{{cite book|first=Leslie|last=Bethell|title=Brazil: Empire and Republic, 1822-1930|publisher=Cambridge University Press|year=1985|page=49}}</ref>
* [[May 7]] – [[Mikhail Semyonovich Vorontsov]] in appointed as [[Governor-General]] of [[Novorossiya]] (New Russia), the portion of [[Russian Empire]] bordering the Black Sea (in modern days it constitutes southern regions of [[Ukraine]]).<ref>"Mikhail Semyonovich Vorontsov", in ''Encyclopædia Britannica''  '''28''' (1910) p. 213.</ref>
* [[May 9]] – Russian author [[Alexander Pushkin]] begins work on his verse novel ''[[Eugene Onegin]]''.<ref>{{cite book|first=Olga Peters|last=Hasty|title=Pushkin's Tatiana|publisher=University of Wisconsin Press|year=1999|page=14}}</ref>
* [[May 23]] – The [[Trienio Liberal|rebel Spanish government]] withdraws from [[Madrid]] to [[Seville]] following the French advance 
* [[May 25]] 
** The [[Louis Antoine, Duke of Angoulême|Duke of Angoulême]], commander of the invading French forces, establishes a regency in [[Madrid]] on behalf of [[Ferdinand VII]] who remains a captive of the Spanish government 
** The [[Catholic Association]], a campaign for religious emancipation, begins in Ireland at a meeting of 13 people at a bookseller's house on [[Capel Street]] in [[Dublin]].<ref>Robert Huish, ''The Memoirs Private and Political of Daniel O'Connell, Esq., M.P., His Times and Contemporaries'' (W. Johnston, 1836) p129</ref>
* [[June 5]] – [[Raffles Institution]] is established (as the Singapore Institution) by the founder of [[Singapore]], Sir [[Stamford Raffles]].