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The 9th century BCE (commonly thought of as BC) was 900-801 BCE.

The 9th century CE (commonly thought of as AD) was 801-900 AD.

Now, many will tell you that the century begins with the zero year (100, 1000, etc.). Not so. Consider that when you count to ten, you start with one, not zero (as in 1-2-3-4-5-6-7-8-9-10); the same is true with calendars.

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12y ago

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