March 14– The Pi Day, giving the most digits of pi when written in mm/dd/yyyy format, (i.e. 3.141593, 3/14/1593) occurs, as realized later. During 1593 Flemish mathematician Adriaan van Roomen is working on the most accurate calculation of pi up to that time and arrives at 16 decimal places of pi using the polygon approximation method), and publishes it in his treatise Ideae mathematicae pars prima (Antverpiae, 1593).[5]
April–June
April 10– The English Parliament enacts a law for the first military disability pension in British history, titled "An Acte for relief of Soudiours". The Act states that "forasmuch as it is agreeable with Christian Charity Policy and the Honour of our Nation, that such as have since the 25th day of March 1588, adventured their lives and lost their limbs or disabled their bodies, or shall hereafter adventure the lives, lose their limbs or disable their bodies, in defence and service of Her Majesty and the State, should at their return be relieved and rewarded to the end that they may reap the fruit of their good deservings, and others may be encouraged to perform like endeavors..."[6]
After April –William Shakespeare's poem Venus and Adonis probably becomes his first published work, printed in London from his own manuscript. In his lifetime it will be his most frequently reprinted work: at least nine times.[8]
May 5– "Dutch church libel" bills posted in London threaten Protestant refugees from France and the Netherlands, alluding to Christopher Marlowe's plays.
May 12– English dramatist Thomas Kyd is arrested over the "Dutch church libel". "Atheist" literature found in his home is claimed to be Marlowe's.[9]
August 24– After losing the Battle of Sisak two months earlier, the Ottoman Empire attacks the Austrian fortress guarding the city and breaks through its walls with cannon fire, forcing its surrender on August 30.
September 10– With no fortress or troops to defend Croatia, Ottoman General Mehmed Pasha captures the city of Sisak. Selânikî Mustafa Efendi, Tarih-i Selânikî (Türk Tarih Kurumu, 1999)
October 28– The Siege of Coevorden begins as the Spanish Army attempts to retake a fortress captured a year earlier by the Dutch Republic and the Kingdom of England.[15]
c. 1593–1604– According to John Warwick Montgomery, the Rosicrucian manifestos are initially composed by Tobias Hess, in anticipation of the opening of the vault in 1604, according to Simon Studion's apocalyptic timetable.
Kenneth M. Swope, A Dragon's Head and a Serpent's Tail: Ming China and the First Great East Asian War, 1592–1598 (University of Oklahoma Press, 2009) p.156
Le Roux, Nicolas (May 13, 2013). La Faveur du Roi: Mignons et courtisans au temps des derniers valois (vers 1547–vers 1589). Éditions Champ Vallon. ISBN9782876737518.
Mark C. Fissel, English Warfare, 1511–1642; Warfare and History. London: Routledge, 2001) p.183 After being halted by winter weather, the Spanish resume the siege in March but abandon it by May 6.