http://en.wikipedia.org/wiki/History...y_Roman_EmpireThe Holy Roman Empire was not able to maintain political unity. In addition to the growing independence of the towns, local rulers turned their counties and duchies into private kingdoms and felt little sense of obligation to the emperor who governed over large parts of the nation in name only. Large parts of what now comprise the Netherlands were governed by the Count of Holland, the Duke of Gelre, the Duke of Brabant and the Bishop of Utrecht. Friesland and Groningen in the north maintained their independence and were governed by the lower nobility.
the Count of Holland, the Duke of Gelre, the Duke of Brabant and the Bishop of Utrecht had their very own kingdoms. There was no 'dutch' kingdom, but i advise you to read the link i gave to see if the dutch were just a province of the HRE or not