Isabelle de Pontac (born 1933) (b. 1933) Parents Jean de Pontac Children Christophe Jean Vital de Gontaut-Biron Sybille Barbara de Gontaut-Biron Alexandra de Gontaut-Biron Siblings Jean François de Pontac, Comte de Pontac Huguette de Pontac Partners Louis-Antoine de Gontaut-Biron