sentences:  Former vassals of Maasdam 
  
  The last vasal of Maasdam, Frans Adam van der Duyn van Maasdam (1771 -1848), was one of the three noblemen who briefly formed the provisional government of the Netherlands after its liberation from Napoleonic France by Prussian and Russian troops in 1813.He was part of the Triumvirate that declared the Sovereign Principality of the United Netherlands in 1813 and invited William Frederick, Prince of Orange-Nassau to return from exile in England and accept sovereignty over the principality.Kees Verkerk, Olympic speed skater