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noble family
Coat of arms of d'Udekem d'Acoz (1999).svg
Coat of Arms of the comital branch since 1999[1]
Country Belgium
Current headCharles-Henri count d´Udekem d´Acoz
TitlesCount, mostly jonkheer
Estate(s)Losange Castle, Couthof Castle, Raepenburg Castle.[2]
Cadet branches
  • d´Udekem d'Acoz
  • d´Udekem Gentinnes
  • d´Udekem de Guertechin

The d'Udekem family (French: [dyd(ə)kɛm]) belongs to the nobility of Belgium since 1816.


The origin of the Udekem family dates back to the Late Middle Ages, with the earliest member recorded as dying in 1472. In the 18th century the Dominium of Acoz was obtained via marriage by the family.

Until 2000, the head of the d'Udekem family held the rank of baron. After the wedding of Mathilde d'Udekem d'Acoz with the Duke of Brabant, King Albert II extended the hereditary title of count to the three brothers Henri, Raoul and Patrick d'Udekem d'Acoz and to all their descendants.[3]

Members of the family were active in politics.

Descendants of Charles Joseph baron d'Udekem d'Acoz[edit]

Charles Joseph Marie Ghislain baron (1921) d'Udekem d'Acoz (1885-1968), lord Mayor of Proven

    • Henri Joseph Adelin François Xavier Marie count (2000) d´Udekem d'Acoz (1933), lord Mayor of Poperinge, married in 2005 to jonkvrouw Marie-Madeleine Kervyn d'Oud Mooreghem (1940)
    • Raoul Paul Adelin François Xavier Marie count (2000) d´Udekem d'Acoz (1935), local politician, married to jonkvrouw Françoise de Maere d'Aertrycke
    1. Bernard Marguerite Jean Charles Marie Ghislain count (2000) d´Udekem d´Acoz (1965)[4]
      married in 1998 to jonkvrouw Marie-Pierre Verhaegen (1966), historian[5][6]
    • Patrick Paul François Xavier Marie Ghislain count (2000) d´Udekem d'Acoz (1936-2008), local politician, married in 1971 to Countess Anna Maria Komorowska (1946)
    1. Mathilde countess (2000) d'Udekem d'Acoz (1973), married to Philippe of Belgium (1960)
    2. Jonkvrouw Marie-Alix (1974-1997)
    3. Elisabeth countess (2000) d'Udekem d'Acoz (1977), married to Margrave Alfonso Pallavicini (1964)
    4. Hélène countess (2000) d'Udekem d'Acoz (1979), married to Baron Nicolas Janssen (1974)
    5. Charles-Henri count (2000) d'Udekem d'Acoz (1985)

Properties of d'Udekem d'Acoz family[edit]


  1. ^ "Une conséquence insoupçonnée du mariage princier Du rouge en prime sur le blason de la famille d'Udekem d'Acoz". Le Soir (in French). Retrieved 2020-08-01.
  2. ^ "Kastelen en herenhuizen".
  3. ^ as per royal decree of 8 November 1999, see: Moniteur Belge, 13 November 1999, p.42488
  4. ^ Etat présent de la noblesse belge, 4th series, 2003 /2014
  5. ^ Jean BASTIAENSEN, Prins Filip en prinses Mathilde: Twee families met geschiedenis, Leuven, Van Halewyck, 1999, ISBN 9789056172626
  6. ^ "Marie-Pierre d'Udekem d'Acoz bekroond met prijs Geheim Leger".