The 6th century ad comes after the 3rd century ad.
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The 6th century was the years 501 to 600.
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The 6th century.
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Zechariah.
6th century before Christ.
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It is the 6th century. 500 years are complete, so that is 5
centuries over and you are into the 5th year of the next century,
so it is the 6th century that you are in.