| 53935 | May.11 | Event | 868 – A copy of the Diamond Sutra is printed in China, making it the oldest known dated printed book. |
| 53936 | May.11 | Event | 912 – Alexander becomes Emperor of the Byzantine Empire. |
| 53937 | May.11 | Event | 1310 – In France, fifty-four members of the Knights Templar are burned at the stake as heretics. |
| 53938 | May.11 | Event | 1647 – Peter Stuyvesant arrives in New Amsterdam to replace Willem Kieft as Director-General of New Netherland, the Dutch colonial settlement in present-day New York City. |
| 53939 | May.11 | Event | 1672 – Franco-Dutch War: Louis XIV of France invades the Netherlands. |
| 53940 | May.11 | Event | 1745 – War of the Austrian Succession: Battle of Fontenoy: French forces defeat an Anglo-Dutch–Hanoverian army. |
| 53911 | May.10 | Death | 2012 – Bernardo Sassetti, Portuguese pianist and composer (b. 1970) |
| 53912 | May.10 | Death | 2012 – Carroll Shelby, American race car driver and designer (b. 1923) |
| 53913 | May.10 | Death | 2012 – Gunnar Sønsteby, Norwegian captain and author (b. 1918) |
| 53914 | May.10 | Death | 2013 – Félix Agramont Cota, Mexican engineer and politician, 8th Governor of Baja California Sur (b. 1918) |
| 53915 | May.10 | Death | 2013 – Vincent Dowling, Irish-American actor and director (b. 1929) |
| 53916 | May.10 | Death | 2014 – Carmen Argibay, Argentinian lawyer and judge (b. 1939) |
| 53917 | May.10 | Death | 2014 – Gene Chyzowych, Ukrainian-American soccer player and coach (b. 1935) |
| 53918 | May.10 | Death | 2014 – Patrick Lucey, American soldier and politician, 38th Governor of Wisconsin (b. 1918) |
| 53919 | May.10 | Death | 2014 – Nash the Slash, Canadian violinist (FM) (b. 1948) |
| 53920 | May.10 | Death | 2015 – Ninad Bedekar, Indian historian, author, and academic (b. 1949) |
| 53921 | May.10 | Death | 2015 – Jack Body, New Zealand composer and photographer (b. 1944) |
| 53922 | May.10 | Death | 2015 – Chris Burden, American sculptor, illustrator, and academic (b. 1946) |
| 53923 | May.10 | Death | 2015 – William T. Cooper, Australian ornithologist and illustrator (b. 1934) |
| 53924 | May.10 | Death | 2015 – Rachel Rosenthal, French-American actress and dancer (b. 1926) |
| 53925 | May.10 | Holiday and observance | Christian feast day:Alphius, Philadelphus and CyrinusAurelian of LimogesCalepodiusCataldComgallDamien of MolokaiGordianus and EpimachusJohn of ÁvilaSolangeMay 10 (Eastern Orthodox liturgics) |
| 53926 | May.10 | Holiday and observance | Children's Day (Maldives) |
| 53927 | May.10 | Holiday and observance | Confederate Memorial Day (North Carolina and South Carolina) |
| 53928 | May.10 | Holiday and observance | Constitution Day (Micronesia) |
| 53929 | May.10 | Holiday and observance | Earliest possible day on which Pentecost can fall, while June 13 is the latest celebrated seven weeks after Easter Day. (Christianity) |
| 53930 | May.10 | Holiday and observance | Flower Festival (Azerbaijan) |
| 53931 | May.10 | Holiday and observance | Golden Spike Day (Promontory, Utah) |
| 53932 | May.10 | Holiday and observance | Independence Day or King's Day, celebrates the declaration of independence of Romania from the Ottoman Empire in 1877. |
| 53933 | May.10 | Holiday and observance | Mother's Day (El Salvador, Guatemala, and Mexico) |
| 53934 | May.11 | Event | 330 – Byzantium is renamed Nova Roma during a dedication ceremony, but it is more popularly referred to as Constantinople. |