cap. v.

And for so much as divers people of our realm are in fear that the aids and tasks which they have given to us beforetime, towards our wars and other business, of their own grant and good will (howsoever they were made), might turn to a bondage to them and their heirs, because they might be at another time found in the rolls, and likewise for the prises taken throughout the realm, in our name, by our ministers, we have granted for us and our heirs that we shall not draw such aids, tasks, nor prises, into a custom for anything that hath been done heretofore, be it by roll or any other precedent that may be founden.