Final answer:
Copper was known as 'cyprium' in Ancient Rome because it was primarily mined in Cyprus, and it was the first metal to be alloyed with tin to create bronze.
Step-by-step explanation:
The metal that was known as 'cyprium' in Ancient Rome, because it was primarily mined in Cyprus, is copper.
Copper was one of the few metals that could occur in nature in a directly usable metallic form. It was also the first metal to be purposefully alloyed with tin to create bronze, which was widely used in Ancient Rome for making tools and goods.