Until the 16th century, the Low Countries – corresponding roughly to the present-day Netherlands, Belgium, and Luxembourg – consisted of a number of duchies, counties, and Prince-bishoprics, almost all of which were under the supremacy of the Holy Roman Empire, with the exception of the county of Flanders, which was under the Kingdom of France.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Which counties in the Low Countries were not ruled by the Holy Roman Empire?
Flanders