Also, for the other two-word answers where an adjective was expected, the second name was already given : "Forbidden City", "Flavian Amphitheatre". Why is it different here ?
Florey should be an answer here.
found frequent use could also be the First Republic of France (1792-1804), which is the period which included the Reign of Terror. That was my first guess, but then the answer was actually far easier.