liberum tenementum

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
LIBERUM TENEMENTUM, pleading. The name of a plea in an action of trespass, 
by which the defendant claims the locus in quo to be his soil and freehold, 
or the soil and freehold of a third person, by whose command he entered. 2 
Salk. 453; 7 T. R. 355; 1 Saund. 299, b, note. 
    
from Bouvier's Law Dictionary, Revised 6th Ed (1856)
LIBERUM TENEMENTUM, estate. The same as, freehold, (q.v.) or frank 
tenement. 2 Bouv. Inst. n. 1690. 
    

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