Short answers, pulled from the story.
John Wycliffe (c. 1328 to the 31st of December 1384) was an English scholastic philosopher, Christian reformer, Catholic priest, and a theology professor at the University of Oxford. He became an influential dissident within the Catholic priesthood during the 14th century and is often considered an important predecessor to Protestantism.
The Council of Constance declared John Wycliffe a heretic on the 4th of May 1415 and banned his writings. His rejection of transubstantiation, his attacks on the papacy and monasticism, and his theory that sinful clergy forfeited authority and property put him in conflict with the Church.
John Wycliffe's theory of dominion held that the church was not allowed to own property or have ecclesiastic courts, and that men in mortal sin were not entitled to exercise authority in church or state, nor to own property. He set out the political form of this argument in De civili dominio, which called for the royal divestment of all church property.
John Wycliffe is traditionally credited with a translation of the Vulgate into Middle English, now known as Wycliffe's Bible, completed before 1384 with later versions by his assistant John Purvey in 1388 and 1395. More recent scholarship has minimised his actual involvement for lack of direct contemporary evidence, and it is not possible to define exactly his part, if any, in the translations.
The Lollards were followers of John Wycliffe, derogatorily named by their orthodox contemporaries in the 15th and 16th centuries. They adopted beliefs attributed to Wycliffe such as predestination and iconoclasm, with some questioning transubstantiation, monasticism, requiem masses, and the role of the Papacy.
The Council of Constance ordered John Wycliffe's remains removed from consecrated church ground, an order confirmed by Pope Martin V and carried out in 1428. His corpse, or a neighbour's, was exhumed, the remains were burned, and the ashes were drowned in the River Swift, which flows through Lutterworth.
John Wycliffe's writings in Latin greatly influenced the philosophy and teaching of the Czech reformer Jan Hus (c. 1369 to 1415). Hus' De Ecclesia summarised Wycliffe's work of the same name, with additional material drawn from Wycliffe's De potentate papae.