Oldcastle Revolt religious beliefs were considerably influenced by Lollard cleric William Swynderby, who preached in Almeley during his youth. Lollardy was a politico-religious movement initiated by prominent theologian John Wycliffe in the 1370s during his service in the University of Oxford. Lollard beliefs were outlined in the 1395 The Twelve Conclusions of the Lollards, which dealt with their opposition to capital punishment, rejection of religious celibacy, and belief that members of the Clergy should be held accountable to civil laws. The Conclusions also rejected pilgrimages, ornamentation of churches, and religious images because these were said to take away from the true nature
John Wycliffe irritated by this encounter, and attacks upon Wycliffe began. The second and third books of his work dealing with civil government carry a sharp polemic. On 22 May 1377 Pope Gregory XI sent five copies of a bull against Wycliffe, dispatching one to the Archbishop of Canterbury, and the others to the Bishop of London, King Edward III, the Chancellor, and the university; among the enclosures were 18 theses of his, which were denounced as erroneous and dangerous to Church and State. Stephen Lahey suggests that Gregory's action against Wycliffe was an attempt to put pressure on King Edward to