Various, Encyclopaedia Britannica, 11th Edition…
“ Louis encouraged the cities to surround themselves with strong walls. He himself erected a whole cordon of forts round the flourishing mining towns of northern Hungary. He also appointed Hungarian consuls in foreign trade centres, and established a system of protective tariffs. More important in its ulterior consequences to Hungary was the law of 1351 which, while confirming the Golden Bull in general, abrogated the clause (iv.) by which the nobles had the right to alienate their lands. ”
