Final answer:
Attila was the leader of the Huns who put pressure on the Roman Empire during the 5th century, but failed to conquer it due to sickness and famine.
Step-by-step explanation:
The leader of the Huns who put pressure on the Roman Empire's borders during the 5th century was Attila.
Attila the Hun was a powerful and feared leader who led his armies against the Roman Empire. He raided and pillaged Roman cities, causing great devastation.
However, despite his military prowess, Attila failed to conquer the Roman Empire. He faced setbacks such as sickness and famine, which weakened his forces and prevented him from achieving his goal.
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