Free warren is a franchise , erected for the preservation or custody ( which the word signifies ) of beasts and fowls of warren; which , being feræ naturæ , every one had a natural right to kill as he could : but upon the introduction of the forest laws, at the period of the Norman conquest, these animals being looked upon as royal game and the sole property of our savage monarchs, this franchise of free-warren was invented to protect them; by giving the grantee a sole and exclusive power of killing such game so far as his warren extended, on condition of his preventing other persons. A man therefore that has the franchise of a warren, is in reality no more than a royal gamekeeper; but no man, not even a lord of a manor, could by common law justify sporting on another's soil, unless he had the liberty of free-warren.