The Collaborative International Dictionary of English v.0.48:

Capitulary \Ca*pit"u*la*ry\, n.; pl. Capitularies. [See
   Capitular.]
   1. A capitular.
      [1913 Webster]

   2. The body of laws or statutes of a chapter, or of an
      ecclesiastical council.
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   3. A collection of laws or statutes, civil and
      ecclesiastical, esp. of the Frankish kings, in chapters or
      sections.
      [1913 Webster]

            Several of Charlemagne's capitularies. --Hallam.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

CAPITULARIES.The Capitularia or Capitularies, was a code of laws promulgated
by Childebert, Clotaire, Carloman, Pepin, Charlemagne, and other kings. It
was so called from the small chapters or heads into which they were divided.
The edition by Baluze, published in 1677, is said to be the best.