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.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): What kingdom was a holy Roman empire under?
unanswerable