When should you capitalize the word 'millennium'?

When should you capitalize the word 'millennium'?

The word 'millennium' should be capitalized in the following instances:

1. At the beginning of a sentence: "The Millennium was a time of great change and technological advancements."

2. When it is part of a proper noun or a specific event: "We celebrated the arrival of the new Millennium with a grand party."

3. When it is used as a title or heading: "The Millennium Project: A Vision for the Future."

4. When it is used in a religious or cultural context: "The Second Coming is believed to occur at the turn of the Millennium."

However, if the word 'millennium' is used in a general sense to refer to any period of a thousand years, it does not need to be capitalized: "The Roman Empire lasted for several millennia."