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It is in the 6th century bc.
6th century BC.
6th century BC
The century for 561 bc, or more correctly 561 BC (also, BC is sometimes termed BCE)
is: The 6th century BC
The 6th century BC began on the year 600 BC and finished on 501 BC. So from 2000 AD it is 2,500-2,600 years old.