During the 15th century English prose was gradually being brought into a shape fitting it for more serious uses. In the controversy between the Church and the Lollards Latin was still mainly employed, but Wiclif had written some of his tracts in English, and, in 1449, Reginald Peacock, Bishop of St. Asaph, contributed, in English, to the same controversy, _The Repressor of Overmuch Blaming of the Clergy_. Sir John Fortescue, who was chief-justice of the King's Bench from 1442-1460, wrote during the reign of Edward IV. a book on the _Difference between Absolute and Limited Monarchy_, which may be regarded as the first treatise on political philosophy and constitutional law in the language. But these works hardly belong to pure literature, and are remarkable only as early, though not very good, examples of English prose in a barren time. The 15th century was an era of decay and change. The Middle Age was dying, Church and State were slowly disintegrating under the new intellectual influences that were working secretly under ground. In England the civil wars of the Red and White Roses were breaking up the old feudal society by decimating and impoverishing the baronage, thus preparing the way for the centralized monarchy of the Tudors. Toward the close of that century, and early in the next, happened the four great events, or series of events, which freed and widened men's minds, and, in a succession of shocks, overthrew the mediaeval system of life and thought. These were the invention of printing, the Renaissance, or revival of classical learning, the discovery of America, and the Protestant Reformation.