- For the birth and deaths of characters, see Timeline/Characters.
| “ | "Time was the one inescapable constant, in all things. Even the mighty god-warriors were not immune to its passage… though they were revered above all others in Shuriman culture." |
—  Zilean, The Chronokeeper
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 |
This article compiles all the official sources published by Riot Games into a non-exhaustive timeline of recorded important events in the 
League of Legends 
Runeterra Prime universe. This should not be considered as an official timeline but should be as accurate as, and more complete than, any timeline that Riot Games currently has provided.
Calendar
Noxian Calendar
The terms Before Noxus (BN; Before the founding of Noxus) and After Noxus (AN; After the founding of Noxus) are wiki-made dating systems and are used to label or number years in the calendar. Numbering in this calendar is based on the founding of 
Noxus, as this is the method used by the official sources. All dates are considered to be spans of time from one to the next since many events are only given vague ordering and estimated dates.
With territories spread across Runeterra, the empire of Noxus has united and assimilated countless smaller nations over the course of centuries. Aside from its obvious military strength and stable, central governance, Noxus takes great pride in "bringing the calendar" to every corner of the globe.
But to be Noxian is to subscribe to their notion of world history, which begins long before the Rune Wars that gave rise to the empire. Since many historical records were lost in those dark times, the precise details of anything earlier is likely based on conjecture, or popular myth.
History
| “ | "Past! Present! And future! All in my hands." |
| — Zilean, The Chronokeeper
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|
For easier navigation, the Timeline is split into several key historical events and periods:
∞ BN - ± 9000 BN
± 9000 BN - 8000 BN
± 9000 BN - 8000 BN
8000 BN
6000 BN - 5000 BN
5000 BN - 2500 BN
2500 BN - 2000 BN
2500 BN - 2000 BN
2000 BN - 550 BN
400 BN - 100 BN
25 BN
25 BN - 3 BN
0 - 787 AN
787 AN - 945 AN
945 AN - 989 AN
989 AN - 997 AN
997 AN - ∞
Trivia
- The first official timeline was revealed in the Realms of Runeterra encyclopedia book and formed the foundation for this Unofficial Timeline.
- The concept of time travel being canonized in the main League of Legends lore has created a canon omniverse bearing infinite possible timelines.
- The
Runeterra Legacy universe has a timeline calendar that uses terms Before Common League Era (BCLE; Before the founding of the Institute of War) and Common League Era (CLE; After the founding of the Institute of War) as its own dating systems. It functions relatively the same as the real world calendar, even having the same number of days in 12 months as well as having the same names (January, February, March, etc.) for those months. It was commonly used in the Journal of Justice and League Judgements, with the calendar's farthest known modern date being May 21st, 22 CLE until the eventual retcon of the old lore for the new canon of Runeterra Prime. - The High Noon universe has a timeline calendar similar to the real world Gregorian calendar, with the farthest known modern date being June 15th, 1868 in With Hell Before Them. The specific calendar years chosen correlate with the end of the "cowboy era" and the rapid industrialization of America.
- The Arcane universe has shown to have some sort of timeline, however it is unclear if it uses the same system as Runeterra Prime, or has its own dating system.
- The Worldbreaker universe has a dating system measured in cycles, with end of each cycle bringing forth the destruction of the old world and the birth of a new one, similar to real-world mesoamerican cultures.
- While the PROJECT universe has an undefined calendar dating system, it has a timeline of events that start from the creation of PROJECT City.
- Contemporary universes such as Day Job, Dunkmaster, Luchador, Music, Valorant, and Wonders of the World all use similar or near identical calendars to the real world.
- The
