1644 events in history

Feb 29 Abel Tasman's second Pacific voyage began
Mar 18 The Third Anglo-Powhatan War begins in the Colony of Virginia
Apr 25 The Chongzhen Emperor, the last Emperor of Ming Dynasty China, commits suicide during a peasant rebellion led by Li Zicheng
May 25 Ming general Wu Sangui forms an alliance with the invading Manchus and opens the gates of the Great Wall of China at Shanhaiguan pass, letting the Manchus through towards the capital Beijing
May 26 Portuguese Restoration War: Portuguese and Spanish forces both claim victory in the Battle of Montijo
May 27 Manchu regent Dorgon defeats rebel leader Li Zicheng of the Shun dynasty at the Battle of Shanhai Pass, allowing the Manchus to enter and conquer the capital city of Beijing
May 28 Bolton Massacre by Royalist troops under the command of James Stanley, 7th Earl of Derby
Jun 6 The Qing dynasty Manchu forces led by the Shunzhi Emperor capture Beijing during the collapse of the Ming dynasty
Jun 29 Charles I of England defeats a Parliamentarian detachment at the Battle of Cropredy Bridge, the last battle won by an English King on English soil
Jul 2 English Civil War: Battle of Marston Moor
Sep 1 Battle of Tippermuir: James Graham, 1st Marquess of Montrose defeats the Earl of Wemyss's Covenanters, reviving the Royalist cause
Oct 13 A Swedish–Dutch fleet defeats the Danish fleet at Fehmarn and captures about 1,000 prisoners
Oct 27 Second Battle of Newbury in the English Civil War
Nov 8 The Shunzhi Emperor, the third emperor of the Qing dynasty, is enthroned in Beijing after the collapse of the Ming dynasty as the first Qing emperor to rule over China
Nov 23 John Milton publishes Areopagitica, a pamphlet decrying censorship