The Collaborative International Dictionary of English v.0.48:

Parage \Par"age\, n. [F., fr. L. par, adj., equal. Cf.
   Peerage, Peer an equal.]
   1. (Old Eng. Law) Equality of condition, blood, or dignity;
      also, equality in the partition of an inheritance.
      --Spelman.
      [1913 Webster]

   2. (Feudal Law) Equality of condition between persons holding
      unequal portions of a fee. --Burrill.
      [1913 Webster]

   3. Kindred; family; birth. [Obs.] --Ld. Berners.
      [1913 Webster]

            We claim to be of high parage.        --Chaucer.
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Bouvier's Law Dictionary, Revised 6th Ed (1856):

PARAGE. Equality of name or blood, but more especially of land in the
partition of an inheritance among co-heirs, hence comes disparage and
disparagement. Co. Litt. 166.