The Catholic relief act passed by the Irish parliament in 1778 was the first significant breach of that comprehensive system of legal discrimination against Irish Catholics known in the eighteenth century as the Popery laws. The act of 1778 removed virtually all of the legal restrictions respecting the acquisition and free testamentary disposition of landed property imposed on Irish Catholics by the legislators of William III and Anne and formed a powerful precedent for the subsequent acts of 1782 and 1791–93 that repealed discriminatory statutes affecting the Irish Catholic hierarchy, secular clergy, and the Catholic business and professional classes. While most scholars have fully recognized the revolutionary character of this act and have discussed its provisions many times, a mistaken impression that no detailed record of this measure's passage through the Irish house of commons existed has discouraged original research into the complicated set of circumstances surrounding its enactment. Consequently, the relation of the Anglo-American crisis to the cause of Catholic relief, the connection between this particular act and the movement for Irish legislative independence during the later phases of the war for American independence, and the extraordinary arguments and tactics employed by supporters and opponents of the bill in an exclusively Protestant parliament have remained unnoticed.