Dutch Republic:

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.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What three countries were under the Kingdom of France?
unanswerable