Lollardy was a proto-Protestant Christian religious movement that was active in England from the mid-14th century until the 16th-century English Reformation. It was initially led by John Wycliffe, a Catholic theologian who was later dismissed from the University of Oxford in 1381 for heresy. The Lollards' demands were primarily for reform of Western Christianity. They formulated their beliefs in the Twelve Conclusions of the Lollards.

Episode artwork: Artist: William Frederick Yeames, 1835-1918. License: Public domain. Content adapted from Wikipedia (https://en.wikipedia.org/wiki/Lollardy), used under the Creative Commons Attribution-ShareAlike License.

John Wycliffe (; also spelled Wyclif, Wickliffe, Wicklyf etc.; c. 1328 – 31 December 1384) 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, though more recent scholarship has minimised the extent of his advocacy or involvement for lack of direct contemporary evidence. He became an influential dissident within the Catholic priesthood during the 14th century and his ideas are often considered an important predecessor to Protestantism. His political-theological theory of dominion meant that the church was not allowed to own property or have ecclesiastic courts, and men in mortal sin were not entitled to exercise authority in the church or state, nor to own property. Wycliffe insisted on the radical poverty of all clergy. Wycliffe has been characterised as the "evening star" of scholasticism and as the "morning star" or stella matutina of the English Reformation. Certain of Wycliffe's later followers, derogatorily called Lollards by their orthodox contemporaries in the 15th and 16th centuries, adopted a number of the beliefs attributed to Wycliffe such as theological virtues, predestination, iconoclasm, and the notion of caesaropapism, with some questioning the veneration of saints, the sacraments, requiem masses, transubstantiation, monasticism, and the legitimacy or role of the Papacy. Wycliffe's writings in Latin greatly influenced the philosophy and teaching of the Czech reformer Jan Hus (c. 1369–1415).

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The Western Schism, also known as the Great Divide, the Great Occidental Schism, the Schism of 1378, or the Great Western Schism (Latin: Magnum schisma occidentale, Ecclesiae occidentalis schisma), was a split within the Catholic Church lasting from 20 September 1378 to 11 November 1417, in which bishops residing in Rome and Avignon simultaneously claimed to be the true pope, and were eventually joined by a line of Pisan claimants in 1409. The event was driven by international rivalries, personalities and political allegiances, with the Avignon Papacy in particular being closely tied to the French monarchy. The papacy had resided in Avignon since 1309, but Pope Gregory XI returned to Rome in 1377. The Catholic Church split in September 1378, when, following Gregory XI's death and Urban VI's subsequent election, a group of French cardinals declared his election invalid due to intimidation and violence and, in the presence of three Italian cardinals, elected Clement VII, who claimed to be the true pope. As Roman claimant, Urban VI was succeeded by Boniface IX, Innocent VII and Gregory XII. Clement VII was succeeded as Avignon claimant by Benedict XIII. Following several attempts at reconciliation, the Council of Pisa (1409) declared that both Gregory XII and Benedict XIII were heretical and schismatic, and elected another pope, Alexander V. The schism was finally resolved when Alexander V's successor as Pisan claimant, Antipope John XXIII, called the Council of Constance (1414–1418). The Council arranged for the renunciation of both Roman pope Gregory XII and Pisan antipope John XXIII. The Avignon antipope Benedict XIII was excommunicated, while Pope Martin V was elected and reigned from Rome. The split is sometimes referred to as the 'Great Schism', although this term is usually reserved for the East–West Schism of 1054 between the churches remaining in communion with the See of Rome and those remaining with the See of Constantinople.

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The Avignon Papacy was the period from 1309 to 1376 during which seven successive popes resided in Avignon (at the time within the Kingdom of Arles, part of the Holy Roman Empire, now part of France) rather than in Rome. The situation arose from the conflict between the papacy and the French crown, culminating in the death of Pope Boniface VIII after his arrest and maltreatment by agents of ...

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Thomas Becket , also known as Saint Thomas of Canterbury, Thomas of London and later Thomas à Becket who lived from 1119 to 1170, was an English cleric and statesman who served as Lord Chancellor from 1155 to 1162, and then as Archbishop of Canterbury from 1162 until his death in 1170. He is known for his conflict with King Henry II over the rights and privileges of the Church and was murdered ...

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Anselm of Canterbury , who lived from 1033 to 1109,, also known as Anselm of Aosta after his birthplace and Anselm of Bec after his monastery, was an Italian Benedictine monk, abbot, philosopher, and theologian of the Catholic Church, who served as Archbishop of Canterbury from 1093 to 1109. As Archbishop of Canterbury, he defended the church's interests in England amid the Investiture Contro...

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Lanfrank , born around 1010 and died 24 May 1089, was an Italian-born English churchman, monk and scholar. Born in Italy, he moved to Normandy to become a Benedictine monk at Bec. He served successively as prior of Bec Abbey and abbot of Saint Stephen's Abbey in Caen, Normandy and then as Archbishop of Canterbury in England, following its conquest by William the Conqueror. He is also variously...

Episode artwork: Artist: Ealdgyth. License: CC BY-SA 3.0. Content adapted from Wikipedia (https://en.wikipedia.org/wiki/Lanfranc), used under the Creative Commons Attribution-ShareAlike License.

The Norman Conquest of England (or the Conquest) was an 11th-century invasion by an army made up of thousands of Norman, French, Flemish, and Breton troops, all led by the Duke of Normandy, later styled William the Conqueror. William's claim to the English throne derived from his familial relationship with the childless Anglo-Saxon king Edward the Confessor who may have encouraged William's hop...

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The English Benedictine Reform or Monastic Reform of the English church in the late tenth century was a religious and intellectual movement in the later Anglo-Saxon period. In the mid-tenth century almost all monasteries were staffed by secular clergy who were often married. The reformers sought to replace them with celibate contemplative monks following the Rule of Saint Benedict. The movement...

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Viking activity in the British Isles occurred during the Early Middle Ages, the 8th to the 11th centuries , when Scandinavians travelled to the British Isles to raid, conquer, settle, and trade. They are generally referred to as Vikings, but some scholars debate whether the term Viking represented all Scandinavian settlers or just those who used violence. At the start of the early medieval peri...

Episode artwork: Artist: Peter Nicolai Arbo. License: Public domain. Content adapted from Wikipedia (https://en.wikipedia.org/wiki/Viking_activity_in_the_British_Isles, https://en.wikipedia.org/wiki/Danelaw), used under the Creative Commons Attribution-ShareAlike License.