The League of Legends universe operates on the Noxian Calendar system, which marks time relative to the founding of Noxus. Events are marked as BN (Before Noxus) or AN (After Noxus), though the exact duration of a Noxian year remains undefined.

Major Historical Periods (in chronological order):

1. Creation of the Universe
2. Formation of Runeterra
3. Titan War
4. Founding of the Freljord
5. War of the Three Sisters
6. Westward Migration
7. Golden Age of Shurima
8. Void War
9. Fall of Shurima
10. Great Darkin War
11. Ruination of Helia
12. Rune Wars
13. Resurgence of Civilizations
14. First Demacian-Noxian War

Recent and Future Events:

• Noxian Invasion of Ionia
• Rebirth of the Sun Disc
• Return of the Ruined King
• Great Mage Rebellion

Notable Timeline Features:

• The timeline incorporates multiple parallel universes and alternate realities
• Time travel is canonically possible within the universe
• Historical records before the Resurgence of Civilizations are largely incomplete due to the Rune Wars
• Noxus serves as the primary historical record keeper, though their accounts may be biased

Alternative Universe Calendars:

• Runeterra Legacy: Uses BCLE/CLE (Before/After Common League Era)
• High Noon: Similar to real-world Gregorian calendar
• Worldbreaker: Measures time in cycles
• PROJECT: Timeline starts from city creation
• Contemporary universes: Match real-world calendar

Annual Events:

• Lunar Revel (Chinese New Year)
• League of Lovers (Valentine's Day)
• Masquerade (Carnival)
• Great Hunt (Easter)
• Pool Party (Summer)
• World Championship (October)
• Harrowing (Halloween)
• Snowdown Showdown (Christmas)

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