Willem Karel de Perponcher (1775-1857) (1775–1857) Parents Cornelius de Perponcher Sedlnitsky Johanna Maria van Tuyll van Serooskerken Children Leonardus de Perponcher Fredrik Adriaan de Perponcher Siblings Hendrik George de Perponcher Sedlnitsky Arend Jacob Diederik de Perponcher Sedlnitsky