Editing 1555 (section)

=== April&ndash;June ===
* [[April 9]] &ndash; Marcello Cervini degli Spannocchi is unanimously chosen as the successor to [[Pope Julius III]], who died on March 23, and takes the name of [[Pope Marcellus II]] as the 222nd Pontiff of the Roman Catholic Church. He will reign for 22 days.<ref>{{cite book|author=Maureen E. Buja|title=Antonio Barré and Music Printing in Mid-sixteenth Century Rome|url=https://books.google.com/books?id=zqIIAQAAMAAJ|year=1996|publisher=University of North Carolina at Chapel Hill|page=81}}</ref>
* [[April 17]] &ndash; After 18 months of siege, the [[Republic of Siena]] surrenders to the [[Florence|Florentine]]–[[Holy Roman Empire|Imperial]] army.
* [[May 1]] &ndash; Foundation of [[St John's College, Oxford]], England, to teach Catholic theology.
* [[May 30]] &ndash; Foundation of [[Trinity College, Oxford]], England, to teach Catholic theology.
* [[May 15]] &ndash; The [[May 1555 papal conclave|conclave]] opens with 42 of the 56 Roman Catholic cardinals to choose a successor to Pope Marcellus II, who had died on May 1.<ref>Chacón, col. 810-811; Panvinio, s. 427-428; por. Setton, s. 617.</ref>
* [[May 23]] &ndash; Giovanni Pietro Carafa, Cardinal of Naples, is elected as the new Pope after Giacomo del Pozzo fails to obtain the necessary two-thirds approval.<ref>Pastor, Ludwig von. ''History of the Popes''. T. 14. London: Routledge & Kegan Paul, 1924</ref> Carafa, the 223rd Pope, takes the name [[Pope Paul IV]].<ref>{{cite book|author=Paul Johnson|title=The Papacy|url=https://books.google.com/books?id=Ms4MgIorzdUC|year=1997|publisher=Barnes & Noble Books|isbn=978-0-7607-0755-5|page=216}}</ref>
* [[May 25]] &ndash; [[Jeanne d'Albret]] becomes the [[List of Navarrese monarchs|Queen of Navarre]] upon the death of her father, [[Henry II of Navarre|King Henry II]].<ref name="Love2001">{{cite book|author=Ronald Love|title=Blood and Religion: The Conscience of Henri IV|url=https://books.google.com/books?id=R8r73hru8nAC&pg=PA25|date=14 March 2001|publisher=McGill-Queen's Press - MQUP|isbn=978-0-7735-6884-6|pages=25–}}</ref>
* [[June 1]] &ndash; The [[Treaty of Amasya]] between the [[Ottoman Empire]] and [[Safavid Persia]] concludes the [[Ottoman–Safavid War (1532–1555)|Ottoman-Safavid War]].
* [[June 22]] &ndash; [[Adil Shah Suri]] becomes the Sultan of the [[Sur Empire]] at [[Delhi]] in [[India]] after [[Sikandar Shah Suri]] is forced to flee from the Mughal Empire forces.