Marquess of Heusden (Dutch: Markies van Heusden) is a high-ranking Dutch title of nobility retained by the Earl of Clancarty. The 2nd Earl of Clancarty, an Anglo-Irish peer, was credited with resolving various border disputes in the Netherlands, Germany and Italy at the Congress of Vienna (1814 – 1815) and in his role as Ambassador to the Netherlands. For his service as ambassador to The Hague, he was raised into the Dutch nobility with the creation of the hereditary title Markies van Heusden (Marquess of Heusden) by King Willem I of the Netherlands (royal decree 8 July 1815 no. 14).

Nobility

The 2nd Earl of Clancarty and all his descendants belong to the Dutch nobility, in which all the descendant Earls have the title of Marquess of Heusden; the remainder of the descendants carry the Dutch honorific style of Jonkheer or Jonkvrouw. Only two non-Dutch lineages living outside of the Netherlands have been raised into the Dutch nobility: the Le Poer Trench family and the Wellesley family, with the Duke of Wellington as the Prince of Waterloo.

Marquesse of Heusden (1815)

There is no heir to the marquessate.