-99
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That would be the 23rd Century - the first century AD was between 1 - 100, hence the disparity in century names and years.
2700-2300 bc
The first century AD
The sixth century AD covers the years from 501 AD to 600 AD.
Any year between 1501 AD and 1600 AD - including 1537 - is in the sixteenth century.
20th century.