The Universities continued to flourish during almost the whole of this period. It was from Oxford as a centre, under the influence of John Wycliffe, a lecturer there, that a great revival and reforming movement in the church emanated. From about 1370 Wycliffe and others began to agitate for a more earnest religious life. They translated the Bible into English, wrote devotional and polemic tracts, preached throughout the country, spoke and wrote against the evils in the church at the time, then against its accepted form of organization, and finally against its official teachings. They thus became heretics. Thousands were influenced by their teachings, and a wave of religious revival and ecclesiastical rebellion spread over the country. The powers of the church and the civil government were ultimately brought to bear to crush out the "Lollards," as those who held heretical beliefs at that time were called. New and stringent laws were passed in 1401 and 1415, several persons were burned at the stake, and a large number forced to recant, or frightened into keeping their opinions secret. This religious movement gradually died out, and by the middle of the fifteenth century nothing more is heard of Lollardry. Wycliffe had been not only a religious innovator, but a writer of much excellent English. Contemporary with him or slightly later were a number of writers who used the native language and created permanent works of literature. _The Vision of Piers Plowman_ is the longest and best of a number of poems written by otherwise unknown men. Geoffrey Chaucer, one of England's greatest poets, wrote at first in French, then in English; his _Canterbury Tales_ showing a perfected English form, borrowed originally, like so much of what was best in England at the time, from Italy or France, but assimilated, improved, and reconstructed until it seemed a purely English production. During the reign of Edward III English became the official language of the courts and the usual language of conversation, even among the higher classes.