Sybille de Selys Longchamps

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Sybille de Selys Longchamps
Born (1941-08-28) 28 August 1941 (age 75)
Uccle, Belgium
Spouse(s) Jacques Boël (m.1962-1978)
Michael Anthony Rathborne Cayzer (m.1982-1990)
Children Delphine Boël
  • Michel François de Selys Longchamps (father)
  • Pauline Cornet de Ways-Ruart (mother)

Baroness Sybille de Selys Longchamps (born 28 August 1941) is a Belgian aristocrat. She is the mother of Delphine Boël, who claims to be the illegitimate daughter of Albert II of Belgium, former King of the Belgians.

Born in Uccle, Belgium, she is the daughter of Count and ambassador Michel François de Selys Longchamps (1910–1983) and Countess Pauline Cornet de Ways-Ruart (1914–1953). In 1962, she married Jacques Boël (born in 1929), an industrialist and nephew of René Boël. They divorced in 1978 and in 1982 Sybille married a wealthy British widower, the Honourable Michael Anthony Rathborne Cayzer (1929–1990), a younger son of shipping tycoon Herbert Cayzer, 1st Baron Rotherwick.

In 1968, Delphine Boël was born, allegedly from an extramarital affair with Albert of Belgium, who was not king at the time. The purported affair was made public in 1999.

Sybille lived with her second husband in London and at his rural estate until the early 1990s and lives now in Brussels and the Provence.


  • Oscar Coomans de Brachène, État présent de la noblesse belge, Annuaire de 1998, première partie (de Selys Longchamps), p. 187-197, Brussels, 1998.
  • Oscar Coomans e Brachène, État présent de la noblesse belge, Annuaire de 2003, seconde partie (Boël), p. 354-358, Brussels, 2003.
  • Delphine Boël, Couper le cordon, Brussels, ed. Wever & Bergh, 2008