View source for 1668

=== January&ndash;March ===
* [[January 23]] &ndash; The [[Triple Alliance (1668)|Triple Alliance of 1668]] is formed between [[Kingdom of England|England]], [[Sweden]] and the [[Dutch Republic|United Provinces of the Netherlands]]. 
* [[February 13]] &ndash; In [[Lisbon]], a [[Treaty of Lisbon (1668)|peace treaty]] is established between [[Afonso VI of Portugal]] and [[Carlos II of Spain]], by mediation of [[Charles II of England]], in which the legitimacy of the Portuguese monarch is recognized. Portugal yields [[Ceuta]] to Spain. 
* c. February &ndash; The English Parliament and bishops seek to suppress [[Thomas Hobbes]]' treatise ''[[Leviathan (Hobbes book)|Leviathan]]''.<ref>{{cite book|author-link=Jenny Uglow|first=Jenny|last=Uglow|title=A Gambling Man|location=London|publisher=Faber|year=2010|orig-date=2009|isbn=978-0-571-21734-2|page=443}}</ref>
* [[March 8]] &ndash; In the [[Cretan War (1645–1669)|Cretan War]], the navy of the [[Republic of Venice]] defeats an Ottoman Empire naval force of 12 ships and 2,000 galleys that had attempted to seize a small Venetian galley near the port of [[Agia Pelagia]].
*[[March 22]] &ndash; Notable [[Privateer]] [[Henry Morgan]] lands in [[Cuba]] to raid and plunder the inland town of [[Puerto del Príncipe]] during the latter stages of the [[Anglo-Spanish War (1654–1660)]].<ref>{{cite book |last1=Cruikshank |first1=Ernest Alexander |author1-link=Ernest Alexander Cruikshank |title=The Life of Sir Henry Morgan With an Account of the English Settlement of the Island of Jamaica (1655-1688) |date=1935 |publisher=Macmillan Company of Canada limited |pages=84–87|url=https://books.google.com/books?id=fSr2L48ibosC}}</ref>
* [[March 23]] &ndash; The [[Bawdy House Riots of 1668]] take place in [[London]] when a group of [[English Dissenters]] begins attacking [[brothel]]s, initially as a protest against the harsh enforcement of laws against private worshippers and the lack of enforcement of laws against prostitution. Over a period of three days, rioters who join in the violence destroy brothels in the London districts of Poplar,  Moorfields, East Smithfield, St Leonard's, Shoreditch, St Andrew's and Holborn.  
* [[March 27]] &ndash; King [[Charles II of England]] signs [[Royal Charter of 27 March 1668|an agreement]] with representatives of the [[English East India Company]] to lease the Indian city of [[Bombay]] (modern-day Mumbai) to the company for a rent of 10 pounds sterling per year, with transfer taking effect on September 21.