We forbid that any market or fair be held or suffered except in the
cities of our realm and in the walled boroughs and in castles and in
the safest places, where the customs of our realm, and our common
right, and the dues of our crown, which were constituted by our good
predecessors, cannot suffer loss nor fraud nor violation; for we will
that all things be done with right forms and openly, and in accordance
with judgment and with justice.
Thorpe, _Ancient Laws and Institutes_, 212.