On the morning of 19 August 1772 Gustavus III seized supreme power in Sweden, overthrew the authority of the Estates, and amid the applause of almost all Swedes outside the circle of professional politicians brought the Age of Liberty to an end. On the morrow of the revolution he explicitly abjured sovereignty for himself; he promised his.subjects the constitution of Gustav Adolf; and he did in fact confer on them a liberal and tempered despotism, which may be described as being by Mercier de la Rivière out of The Patriot King. It was a revolution bloodless, popular, and uniquely clement; but it was profoundly disturbing to international relations. Twice in the next nine months it produced crises from which, for a moment, there seemed no issue save a general European war involving all the great powers. It might have been supposed, indeed, that England could stand aside from such a struggle: the countrymen of Wilkes and Junius cared little for Swedish liberty, and had but a dim and confused notion of a parliamentary system in some respects more advanced than their own. But by an odd combination of circumstances, the Constitution of 1720—which Gustavus had overthrown on 19 August—had for some years acquired the status of a major British interest; its maintenance had become one of the linch pins of British foreign policy; and its overthrow was a challenge to a whole system of ideas which had prevailed and grown stronger in the years since the Peace of Paris.