B. Lowe’s topic was the Magna Carta in the Era of the English Civil War. At the time, the Parliament of England did not have a large permanent role in the English system of government. Instead, Parliament functioned as a temporary advisory committee and the monarch would summoned them. Once summoned, a parliament's continued existence was at the king's pleasure, since it was subject to dissolution by him at any time. Yet in spite of this limited role, Parliament had, over the preceding centuries, acquired de facto powers of enough significance that monarchs could not simply ignore them indefinitely. Without question, for a monarch, Parliament's most indispensable power was its ability to raise tax revenues far in excess of all other sources of revenue at the Crown's disposal. By the seventeenth century, Parliament's tax-raising powers had come to be derived from the fact that the gentry was the only stratum of society with the ability and authority to actually collect and remit the most meaningful forms of taxation then available at the local level. This meant that if the king wanted to ensure a smooth collection of revenue, he needed the co-operation of the gentry. For all of the Crown's legal authority, by any modern standard, its resources were limited to the extent that, when the gentry refused to collect the king's taxes on a national scale, the Crown lacked any practical means with which to compel