The "Silver Millennium" is a key backstory element in the "Sailor Moon" franchise, originating from the manga created by Naoko Takeuchi and further adapted in the anime series. It refers to a peaceful and prosperous period on the Moon, lasting for a thousand years, before the events of the main series.
### Key Elements of the Silver Millennium:
1. **Moon Kingdom**: The Silver Millennium was centered around the Moon Kingdom, ruled by Queen