The Coudenberg or Koudenberg is a small hill in central Brussels where the Palace of Coudenberg was built. For nearly 700 years, the Castle and then Palace of Coudenberg was the seat of government of the counts, dukes, archdukes, kings, emperors and governors, who from the 11th century until its destruction in 1731, exerted their sovereignty over the area of the Duchy of Brabant, now in the southern Netherlands and northern Belgium. After several years of recent excavations, the archaeological vestiges of the palace and its foundations are open to the public.