No scutage or aid is to be imposed in the kingdom except by the common counsel of the kingdom, unless for ransoming the person of the king, and knighting his first-born son, and marrying, once, his first-born daughter, and for this a reasonable aid is to be taken. Tallages and aids on the city of London, and on other cities which have such liberties, are to be taken in like manner. And the city of London is to have in full its ancient liberties and free customs, both by water and by land.