| Year | Event | Source |
|---|---|---|
| c. One billion B.C. | Ashlar is bombarded with comets, causing great pain to the dominant lifeform there—the Great Nest, a species of brachiopods controlled by a primitive insectile hive-mind known as the Core. This leaves the planet covered in massive craters that, over time, form mountainous valleys. | Planet of the Apes: The Fall |
| 1999 A.D. | Leo Davidson is born. | |
| February 14, 2029 A.D. | The Oberon encounters the electromagnetic storm. Pericles was sent to the storm. Leo Davidson enters storm to rescue his friend. The Oberon picked up a distress call and enters the storm. | Planet of the Apes |
| 4000 | Written history on Ashlar officially begins. All knowledge of the 1,971 years before is lost. | Planet of the Apes: Force |
| 4976 | Thade is born. | Planet of the Apes: Resistance |
| 4992 | Attar is born. | Planet of the Apes: Force |
| 4994 | Ari is born. | Planet of the Apes: Force |
| November 30, 5021 | Leo crash-lands on Ashlar, near the city of Derkein. | Planet of the Apes |