| 104905 | September 14 | Event | 786 – "Night of the three Caliphs": Harun al-Rashid becomes the Abbasid caliph upon the death of his brother al-Hadi. Birth of Harun's son al-Ma'mun. |
| 104906 | September 14 | Event | 1180 – Battle of Ishibashiyama in Japan. |
| 104907 | September 14 | Event | 1607 – Flight of the Earls from Lough Swilly, Donegal, Ireland. |
| 104908 | September 14 | Event | 1682 – Bishop Gore School, one of the oldest schools in Wales, is founded. |
| 104909 | September 14 | Event | 1741 – George Frideric Handel completes his oratorio Messiah |
| 104910 | September 14 | Event | 1752 – The British Empire adopts the Gregorian calendar, skipping eleven days (the previous day was September 2). |
| 104881 | September 13 | Death | 2013 – Robert J. Behnke, American biologist and academic (b. 1929) |
| 104882 | September 13 | Death | 2013 – Rick Casares, American football player (b. 1931) |
| 104883 | September 13 | Death | 2013 – Luiz Gushiken, Brazilian union leader and politician (b. 1950) |
| 104884 | September 13 | Death | 2013 – Jimmy Herman, Canadian actor (b. 1940) |
| 104885 | September 13 | Death | 2013 – Salustiano Sanchez, Spanish-American super-centenarian (b. 1901) |
| 104886 | September 13 | Death | 2013 – Patti Webster, American minister, publicist, and author (b. 1964) |
| 104887 | September 13 | Death | 2014 – Benjamin Adekunle, Nigerian general (b. 1936) |
| 104888 | September 13 | Death | 2014 – Helen Filarski, American baseball player (b. 1924) |
| 104889 | September 13 | Death | 2014 – Milan Galić, Serbian footballer (b. 1938) |
| 104890 | September 13 | Death | 2014 – Frank Torre, American baseball player and manager (b. 1931) |
| 104891 | September 13 | Death | 2015 – Vivinho, Brazilian footballer (b. 1961) |
| 104892 | September 13 | Death | 2015 – Erma Bergmann, American baseball player (b. 1924) |
| 104893 | September 13 | Death | 2015 – Brian Close, English cricketer and coach (b. 1931) |
| 104894 | September 13 | Death | 2015 – Moses Malone, American basketball player and sportscaster (b. 1955) |
| 104895 | September 13 | Death | 2015 – Gary Richrath, American guitarist, songwriter, and producer (REO Speedwagon) (b. 1949) |
| 104896 | September 13 | Holiday and observance | Christian feast day:Feast of the Cross (Assyrian Church of the East)AiméAmeJohn ChrysostomSeptember 13 (Eastern Orthodox liturgics). |
| 104897 | September 13 | Holiday and observance | Day of the Programmer, during a non-leap year. (International) |
| 104898 | September 13 | Holiday and observance | Día de los Niños Héroes (Mexico) |
| 104899 | September 13 | Holiday and observance | Engineer's Day (Mauritius) |
| 104900 | September 13 | Holiday and observance | Epulum Jovis, celebrated on the Ides of September, during the Ludi Romani. (Roman Empire) |
| 104901 | September 13 | Holiday and observance | International Chocolate Day |
| 104902 | September 14 | Event | 81 – Domitian becomes Emperor of the Roman Empire upon the death of his brother Titus. |
| 104903 | September 14 | Event | 326 – Helena of Constantinople discovers the True Cross and the Holy Sepulchre (Jesus's tomb) in Jerusalem. |
| 104904 | September 14 | Event | 629 – Emperor Heraclius enters Constantinople in triumph after his victory over the Persian Empire. |