Byzantine or Roman Empire: The main language was Latin, the capital was Rome, and it was located in western Europe.

Answer 1

Based on the given information, the empire in question would be the Roman Empire (27 BC – 476 AD). The Byzantine Empire, also known as the Eastern Roman Empire, was a later continuation of the Roman Empire, but it had Greek as its main language and its capital was Constantinople (present-day Istanbul) in what is now Turkey.