This is a famous clause, greatly valued at the time it was framed because of its precise terms and narrow scope (which made evasion difficult), and even more highly valued in after days for exactly opposite reasons. It came indeed to be interpreted in a broad general sense by enthusiasts who, with the fully-developed British constitution before them, read the clause as enunciating the modern doctrine that the Crown can impose no financial burden whatsoever on the people without consent of Parliament. Before discussing how far such an estimate is justified, it will be necessary to examine the historical context, with special reference to two classes of John’s subjects; his feudal tenants, and the citizens of London respectively. I. _Protection of Crown Tenants from arbitrary Exactions._ The pecuniary obligations of the barons may be arranged in two groups according as they depended on the king’s own actions, or were determined by circumstances which lay beyond the royal control. Payments of the former type (such as reliefs and amercements), exigible only at fixed dates or on the occurrence of specific events, were treated of elsewhere in Magna Carta. The present chapter sought to prevent John from extorting additional payments either absolutely at his own discretion, or because of situations which he had purposely created as excuses for demanding money. The entire field of such arbitrary feudal dues was covered by the words “scutages” and “extraordinary aids,”[461] the use of which protected the barons from every sort of compulsory payment which might be demanded by the king at his own discretion. ----- Footnote 461: “Extraordinary” is here applied to all aids other than the three normal ones which, falling due each on a definite occasion, come under the opposite group of fixed payments. -----