Editing 1621 (section)

=== January&ndash;March ===
* [[January 12]] &ndash; [[Şehzade Mehmed (son of Ahmed I)|Şehzade Mehmed]], the 15-year old half-brother of Ottoman Sultan [[Osman II]], is put to death by hanging on Osman's orders. Before dying, Mehmed prays aloud that Osman's reign as Sultan be ruined.
* [[January 18]] &ndash; The Dutch East India Company formally names its fortress at Jayakarta in Indonesia, calling it [[Jakarta|Batavia]]. Upon the independence of the Dutch East Indies as Indonesia in 1945, Batavia will be renamed Jakarta.
* [[January 22]] &ndash; The [[Tianqi (era)|Tianqi era]] begins in Ming Dynasty China, six months after Zhu Changluo becomes the [[Taichang Emperor]].
* [[January 24]] &ndash; Twelve days after the murder of Prince Mehmed on orders of Sultan Osman II, Constantinople is hit by bitter winter weather, leading to rioting by persons who believe that the punishment of Osman is the will of Allah. 
* [[January 28]] &ndash; [[Pope Paul V]] (Camillo Borghese) dies at the age of 70 after 15 years as Pontiff.
* [[January 29]] &ndash; [[Ferdinand II, Holy Roman Emperor]], declares the Elector of the Palatinate, [[Frederick V of the Palatinate|Frederick V]], to be a traitor to the Empire. 
* [[February 9]] &ndash; [[Papal conclave, 1621|Papal Conclave of 1621]]: [[Pope Gregory XV]] succeeds [[Pope Paul V]], as the 234th [[pope]].
* [[February 17]] &ndash; [[Myles Standish]] is appointed as the first commander of [[Plymouth Colony]].<ref>{{cite book |title=Mayflower: A Story of Community, Courage and War |last=Philbrick |first=Nathaniel |author-link=Nathaniel Philbrick |year=2006 |place=New York |publisher=Penguin Books |isbn=978-0-14-311197-9 |url=https://books.google.com/books?id=qk9AXww_XysC|page=84}}</ref>
* [[March 16]] &ndash; [[Samoset]], a [[Mohegan]], visits the settlers of Plymouth Colony and greets them: "Welcome, Englishmen! My name is Samoset."
* [[March 22]] &ndash; The [[Pilgrim Fathers|Pilgrims]] of [[Plymouth Colony]] sign a peace treaty with [[Massasoit]] of the [[Wampanoag people|Wampanoag]]s.
* [[March 31]] &ndash; King [[Philip IV of Spain]] begins his 44-year rule.<ref>{{cite book|author=Claudio Monteverdi|title=The Letters of Claudio Monteverdi|url=https://books.google.com/books?id=tBVL9_1__ioC&pg=PA227|date=31 October 1980|publisher=Cambridge University Press|isbn=978-0-521-23591-4|pages=227}}</ref>