The Classical Civilisation
Guns were invented century after the end of Roman civilisation.
The Hellenic civilisation.
The Greek civilisation deeply influenced the Roman elite.
The Roman did not have any castles. Castles emerged after the end of Roman civilisation, during the Middle Ages.
Roman civilisation started in the city of Rome (that is why it is called Roman). Rome is in Italy.
The Roman army started with the foundation of Rome because of the need for defence. It ended with the end of Roman civilisation.
753-509BC but no one knows the exact date
Roman art was the art of the ancient Roman civilisation. Rome was said to have been founded in 753 BC. Historians give 476 AD as a conventional date for the fall of the western part of the Roman Empire. In that year, the last emperor of the western part of the Roman Empire was deposed by a usurper. This makes about 1,200 years of ancient Roman civilisation.
The Roman numeral for 500,000 is |V| with a line over it. This numeral was introduced in the Middle Ages, after the end of the Roman civilisation.
No they did not. The shilling was a British coin and was introduced centuries after the end of Roman civilisation.
The Roman heating system does not affect us today. It fell out of use soon after the end of Roman civilisation.