| 55051 | May.13 | Death | 2014 – David Malet Armstrong, Australian philosopher and author (b. 1926) |
| 55052 | May.13 | Death | 2014 – Malik Bendjelloul, Swedish director and producer (b. 1977) |
| 55053 | May.13 | Death | 2014 – J. F. Coleman, American soldier and pilot (b. 1918) |
| 55054 | May.13 | Death | 2014 – Ron Stevens, Canadian lawyer and politician (b. 1949) |
| 55055 | May.13 | Death | 2014 – Morning Glory Zell-Ravenheart, American occultist and author (b. 1948) |
| 55056 | May.13 | Death | 2015 – Earl Averill, Jr., American baseball player (b. 1931) |
| 55057 | May.13 | Death | 2015 – Robert Drasnin, American clarinet player and composer (b. 1927) |
| 55058 | May.13 | Death | 2015 – Nina Otkalenko, Russian runner (b. 1928) |
| 55059 | May.13 | Death | 2015 – David Sackett, American-Canadian physician and academic (b. 1934) |
| 55060 | May.13 | Death | 2015 – Gainan Saidkhuzhin, Russian cyclist (b. 1937) |
| 55061 | May.13 | Holiday and observance | Abbotsbury Garland Day (Dorset, England) |
| 55062 | May.13 | Holiday and observance | Christian feast day:Our Lady of FátimaGerard of VillamagnaGlyceriaJohn the Silent (Roman Catholic)Julian of Norwich (Roman Catholic)Frances Perkins (Episcopal Church (USA)ServatiusMay 13 (Eastern Orthodox liturgics) |
| 55063 | May.13 | Holiday and observance | One of the three feast days of the Lemuralia, observed in ancient Rome |
| 55064 | May.13 | Holiday and observance | Rotuma Day (Rotuma) |
| 55065 | May.14 | Event | 1264 – Battle of Lewes: Henry III of England is captured and forced to sign the Mise of Lewes, making Simon de Montfort the de facto ruler of England. |
| 55066 | May.14 | Event | 1509 – Battle of Agnadello: In northern Italy, French forces defeat the Venetians. |
| 55067 | May.14 | Event | 1607 – Jamestown, Virginia is settled as an English colony. |
| 55068 | May.14 | Event | 1608 – The Protestant Union is founded in Auhausen. |
| 55069 | May.14 | Event | 1610 – Henry IV of France is assassinated, bringing Louis XIII to the throne. |
| 55070 | May.14 | Event | 1643 – Four-year-old Louis XIV becomes King of France upon the death of his father, Louis XIII. |
| 55071 | May.14 | Event | 1747 – War of the Austrian Succession: A British fleet under Admiral George Anson defeats the French at the First Battle of Cape Finisterre. |
| 55072 | May.14 | Event | 1787 – In Philadelphia, delegates convene a Constitutional Convention to write a new Constitution for the United States George Washington presides. |
| 55073 | May.14 | Event | 1796 – Edward Jenner administers the first smallpox inoculation. |
| 55074 | May.14 | Event | 1804 – The Lewis and Clark Expedition departs from Camp Dubois and begins its historic journey by traveling up the Missouri River. |
| 55075 | May.14 | Event | 1811 – Paraguay: Pedro Juan Caballero, Fulgencio Yegros and José Gaspar Rodríguez de Francia start actions to depose the Spanish governor |
| 55076 | May.14 | Event | 1836 – The Treaties of Velasco are signed in Velasco, Texas. |
| 55077 | May.14 | Event | 1863 – American Civil War: The Battle of Jackson takes place. |
| 55078 | May.14 | Event | 1868 – Boshin War: The Battle of Utsunomiya Castle ends as former Tokugawa shogunate forces withdraw northward to Aizu by way of Nikkō. |
| 55079 | May.14 | Event | 1870 – The first game of rugby in New Zealand is played in Nelson between Nelson College and the Nelson Rugby Football Club. |
| 55080 | May.14 | Event | 1879 – The first group of 463 Indian indentured laborers arrives in Fiji aboard the Leonidas. |