It was from 501AD to 600AD.
The 6th century was the years 501 to 600.
6th century AD
It is the last year of the 6th century.
6th century BC.
The year 509AD would be in the 6th century.
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.
6th century
The year 560BC, as with any year between 600BC and 501BC, fell in the sixth century BC.
6th-5th century BC
Siddhartha Gautama; 6th century
The sixth century AD covers the years from 501 AD to 600 AD.
Chess is believed to have originated in the early 6th century