What is De Mercatoribus?

Legal Definition
This is the name of a statute passed in the 11 Edw. I.; it is usually called the statute of Acton Burnell De Mercatoribus. It was passed in consequence of the complaints of foreign merchants, who could not recover the claims, because the lands of the debtors could not be sold for their debts. It enacted that the chattels and devisable burgages of the debtor might be sold for the payment of their debts. Cruise, Dig. t. 14, s. 6.
-- Bouviers Law Dictionary
Legal Definition
Concerning merchants. The name of a statute passed in the eleventh year of Edw. I. (1233,) more commonly called the "Statute of Acton Burnel," authorizing the recognizance by statute merchant. See 2 Reeve, Eng. Law, 160-162 ; 2 Bl. Comm. 161.
-- Black's Law Dictionary