Yes, B.C. should be capitalized.
It is capitalized at the beginning of the sentence or when it forms part of the proper noun. Examples: The 2nd century is considered part of the Classical era. The Second Century Initiative is celebrating its anniversary.
It can be. If you are talking about one century as a length of time, ie. one hundred years. It is not. One hundred years ago... One century ago... It's not capitalized. If you are talking about life in the 14th Century, then it is capitalized because you are speaking of a specific set of one hundred years.
If you mean the setting then i would be in ancient china and it was around the 4th century BC.
No, seasons are not capitalized.
A: Chiton
if it is 5th century AD then it is at least 400 years after bc or bce
built in fifth century BC
himilco
Halloween didn't exist in 5th cent BC.
Sophocles
dressed in costume
In the fifth century BC the Phoenician Himilco. Though not much about Himilco is known, it is known that he also explored the coastal areas of France, Spain, and Portugal.
The Fifth century - somewhere between 500 BC and 600 BC
Most of the time it should and would be BC.
Sophocles wrote it.
Fifth Century BC. The first war was in 490 BC, and the second war was in 480-479 BC.