A millennium is a period of 1,000 years.
Timeline of Millennium
A millennium is ten centuries.
1st millennium
1st century = AD 1 – AD 100
2nd century = AD 101 – AD 200
3rd century = AD 201 – AD 300
4th century = AD 301 – AD 400
5th century = AD 401 – AD 500
6th century = AD 501 – AD 600
7th century = AD 601 – AD 700
8th century = AD 701 – AD 800
9th century = AD 801 – AD 900
10th century = AD 901 – AD 1000
2nd millennium
11th century = AD 1001 – AD 1100
12th century = AD 1101 – AD 1200
13th century = AD 1201 – AD 1300
14th century = AD 1301 – AD 1400
15th century = AD 1401 – AD 1500
16th century = AD 1501 – AD 1600
17th century = January 1, 1601 – December 31, 1700
18th century = January 1, 1701 – December 31, 1800
19th century = January 1, 1801 – December 31, 1900
20th century = January 1, 1901 – December 31, 2000
3rd millennium
21st century = January 1, 2001 – December 31, 2100
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