1900 is the last year (the hundredth year) of the 19th century.
Arithmetica is an ancient Greek text on mathematics written by the mathematician Diophantus in the 3rd century CE.
Not 2, but maybe one, Antarctica, or maybe none at all. Long before the 15th Century, CE, all continents, except Antarctica, had permanent and self-perpetuating populations of humans. Even Antarctica allegedly was known to exist before the 15th Century, assuming certain myths were based upon a truth. (see: http://en.wikipedia.org/wiki/Antarctica)
19th century
The Peace of Westphalia 1648 CE.
12th century
12th century
This one:
The 8th Century AD, which is also the 8th Century CE.
The first century CE began at the beginning of 1 CE and ended at the end of 100 CE. The first century BCE ended at the end of 1 BCE, and the second century CE began at the beginning of 101 CE. (Note that there is no year 0, so 1 BCE immediately precedes 1 CE.)
The 8th century AD. AD and CE are the same.
The 13th Century.
The 6th century.
In the West, from the 1st Century BCE to the 4th Century CE. In the East until the 15th Century CE.
the first century
The country that got its independence in 10th Century CE is Denmark.
the year 1000 AD or CE