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Pope Gregory XI issues five papal bulls to denounce the doctrines of English theologian John Wycliffe.

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Pope Gregory XI
Head of the Catholic Church from 1370 to 1378
Pope Gregory XI was head of the Catholic Church from 30 December 1370 to his death, in March 1378. He was the seventh and last Avignon pope and the most recent French pope. In 1377, Gregory XI returned the papal court to Rome, ending nearly 70 years of papal residency in…Source: Wikipedia (CC BY-SA)
Papal bull
Type of decree by the Catholic pope
A papal bull is a type of public decree, letters patent, or charter issued by the pope of the Catholic Church. It is named after the leaden seal (bulla) traditionally appended to authenticate it.Source: Wikipedia (CC BY-SA)
Doctrine
Codification of beliefs
Doctrine is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the essence of teachings in a given branch of knowledge or in a belief system. The etymological Greek analogue is 'catechism'.Source: Wikipedia (CC BY-SA)
Theology
Study of the nature of deities and religious beliefs
Theology is the study of religious belief from a religious perspective, with a focus on the nature of divinity and the history behind religion. It is taught as an academic discipline, typically in universities and seminaries. It occupies itself with the unique content of…Source: Wikipedia (CC BY-SA)
John Wycliffe
English theologian (c. 1331 – 1384)
John Wycliffe was an English scholastic philosopher, Christian reformer, Catholic priest, and a theology professor at the University of Oxford. Wycliffe is traditionally believed to have advocated for or made a vernacular translation of the Vulgate Bible into Middle English,…Source: Wikipedia (CC BY-SA)