propria persona

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
PROPRIA PERSONA. In his own person. It is a rule in pleading that pleas to 
the jurisdiction of the court must be pleaded in propria persona, because, 
if pleaded by attorney, they admit the jurisdiction, as an attorney is an 
officer of the court, and he is presumed to plead after having obtained 
leave, which admits the jurisdiction. Lawes on Pl. 91. 
     2. An appearance may be in propria persona, and need not be by 
attorney. 
    

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