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The Defender of the Bond, or Defensor Matrimonii in Latin, is a Catholic Church official whose duty is to defend the marriage bond in the procedure prescribed for the hearing of matrimonial causes which involve the validity or nullity of a marriage already contracted.

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The Defender of the Bond, or Defensor Matrimonii in Latin, is a Catholic Church official whose duty is to defend the marriage bond in the procedure prescribed for the hearing of matrimonial causes which involve the validity or nullity of a marriage already contracted.