of the month. April–June April 1 – Cardinal Alessandro Ottaviano de' Medici, the Bishop of Pistoia, is elected by the assembled 61 cardinals at the heated Papal conclave after 17 days of balloting. He takes the regnal name of Pope Leo XI to become the 232nd pope, but serves for less than four weeks. April 8 – The city of Oulu () is founded by King Charles IX of Sweden. April 13 – Tsar Boris Godunov dies; Feodor II accedes to the Russian throne. April 16 – Tokugawa Ieyasu abdicates as shōgun of Japan, becoming Ogosho (retired shōgun). His son Tokugawa Hidetada succeeds him to the office. In England, John Winthrop, later governor of the future Massachusetts Bay Colony, marries his first wife (of 4), Mary Forth, daughter of John Forth, of Great Stambridge, Essex. April 27 – Pope Leo XI dies suddenly from a cold at the age of 69, after a reign of only 26 days, prompting the return of the cardinals for the second papal conclave in less than two months. During his brief reign, the Pope issued a bull requiring secret balloting in papal conclaves. May 8 – A group of 59 Roman Catholic cardinals assemble at Rome for another papal conclave to elect a successor to Pope Leo XI. During the meeting, a fistfight breaks out among the cardinals over the two rival candidates, Antonio Sauli and Domenico Toschi, neither of whom receive the necessary 40 votes for a two-thirds election. In the fight, Cardinal Alfonso Visconti sustains several fractures. May 16 – Camillo Borghese, Cardinal Vicar of Rome and cardinal-priest of Sant'Eusebio is elected the 233rd pope, and takes the name of Pope Paul V. Another "Year of Three Popes" will not occur until 373 years later, in 1978]]. Borghese is elected as a compromise candidate after the leads to physical assault. June 1 – Russian troops in Moscow imprison Feodor II and his mother, later executing them. June 20 – Pretender Dmitriy and his supporters, including troops of the Polish–Lithuanian Commonwealth, march to Moscow. July–September July 4 – A proclamation commands all Roman Catholic seminary priests and Jesuits to leave Ireland by December 10 and directs the laity to attend Church of Ireland services. July 13 - A 7.5 earthquake strikes China's Hainan Province causing widespread damage and thousands of deaths. July 21 – Claiming to be Dmitriy, son of Ivan the Terrible,