Henri de Fleury de Coulan, Sieur de Buat, St Sire et La Forest de Gay (died 11 October 1666) was a captain of horse in the army of the Dutch Republic, who became embroiled in a celebrated conspiracy during the First Stadtholderless Period to overthrow the regime of Grand Pensionary Johan de Witt in favor of future Stadtholder William III, known as the Buat Conspiracy. He was convicted of treason in 1666 and executed.
The conspiracy was romanticized in the novel "Elisabeth Musch" (1850),[1] by Jacob van Lennep.
The Dutch poet Constantijn Huygens wrote the following epitaph[2]
which may be translated as:
Ritmeester Buat (1968) was a Dutch TV series with actor Coen Flink in the role of Buat.