Excommunication in the Catholic Church in the context of "Exsurge Domine"

Matilda of Tuscany (Italian: Matilde di Toscana; Latin: Matilda or Mathilda; c. 1046 – 24 July 1115), or Matilda of Canossa (Italian: Matilde di Canossa [maˈtilde di kaˈnɔssa]), also referred to as la Gran Contessa ("the Great Countess"), was a member of the House of Canossa (also known as the Attonids) in the second half of the eleventh century. Matilda was one of the most important governing figures of the Italian Middle Ages. She reigned in a time of constant battles, political intrigues, and excommunications by the Church.

She ruled as a feudal margravine and, as a relative of the imperial Salian dynasty, she brokered a settlement in the so-called Investiture Controversy. In this extensive conflict with the emerging reform Papacy over the relationship between spiritual (sacerdotium) and secular (regnum) power, Pope Gregory VII dismissed and excommunicated the Holy Roman Emperor Henry IV (then King of the Romans) in 1076. At the same time, Matilda came into possession of a substantial territory that included present-day Lombardy, Emilia, Romagna, and Tuscany. She made the Canossa Castle, in the Apennines south west of Reggio Emilia, the centre of her domains.

The Crusading movement was a major religious, political and military endeavour of the Middle Ages—began in 1095 when Pope Urban II, at the Council of Clermont, proclaimed the First Crusade to liberate Eastern Christians from Muslim rule. He framed it as a form of penitential pilgrimage, offering spiritual rewards. By then, papal authority in Western Christendom had grown through church reforms, and tensions with secular rulers encouraged the notion of holy war—combining classical just war theory, biblical precedents, and Augustine's teachings on legitimate violence. Armed pilgrimage aligned with the era's Christocentric and militant Catholicism, sparking widespread enthusiasm. Western expansion was further enabled by economic growth, the decline of older Mediterranean powers, and Muslim disunity. These factors allowed crusaders to seize territory and found four Crusader states. Their defence inspired successive Crusades, and the papacy extended spiritual privileges to campaigns against other targets—Muslims in Iberia, pagans in the Baltic, and other opponents of papal authority.

The Crusades fostered distinctive institutions and ideologies, having a great impact on medieval Europe and the Mediterranean. Though aimed primarily at the warrior elite through appeals to chivalric ideals, they depended on broad support from clergy, townspeople, and peasants. Women, despite being discouraged, were involved as participants, proxies for absent crusaders, or victims. Although many crusaders were motivated by indulgences (remission of sins), material gain also played a part. Crusades were typically initiated through papal bulls, with participants pledging to join by "taking the cross"—sewing a cross onto their garments. Failure to fulfil vows could result in excommunication. Periodic waves of zeal produced unsanctioned "popular crusades".

The Road to Canossa or Humiliation of Canossa (Italian: L'umiliazione di Canossa), or, sometimes, the Walk to Canossa (German: Gang nach Canossa/Kanossa) was the journey of the Holy Roman Emperor Henry IV to Canossa Castle in 1077, and his subsequent ritual submission there to Pope Gregory VII. It took place during the Investiture controversy and involved the Emperor seeking absolution and the revocation of his excommunication by the Pope who had been staying at the castle as the guest of Margravine Matilda of Tuscany.

According to contemporary sources, he was forced to supplicate on his knees, waiting for three days and nights before the castle gate while a blizzard raged, "one of the most dramatic moments of the Middle Ages". The episode has spurred much debate among medieval chroniclers as well as modern historians, who dispute whether the walk was a humiliating defeat for the emperor or a "brilliant masterstroke".

Martin Luther (/ˈluːθər/ LOO-thər; German: [ˈmaʁtiːn ˈlʊtɐ] ; 10 November 1483 – 18 February 1546) was a German priest, theologian, author, hymnwriter, professor, and former Augustinian friar. Luther was the seminal figure of the Protestant Reformation, and his theological beliefs form the basis of Lutheranism. He is widely regarded as one of the most influential figures in Western and Christian history.

Born in Eisleben, Luther was ordained to the priesthood in 1507. He came to reject several teachings and practices of the contemporary Roman Catholic Church, in particular the view on indulgences and papal authority. Luther initiated an international debate on these in works like his Ninety-five Theses, which he authored in 1517. In 1520 Pope Leo X demanded that Luther renounce all of his writings, and when Luther refused to do so, excommunicated him in January 1521. Later that year, Holy Roman Emperor Charles V condemned Luther as an outlaw at the Diet of Worms. When Luther died in 1546, his excommunication by Leo X was still in effect.

Louis VIII (5 September 1187 – 8 November 1226), nicknamed The Lion (French: Le Lion), was King of France from 1223 to 1226. As a prince, he invaded England on 21 May 1216 and was excommunicated by a papal legate on 29 May 1216. On 2 June 1216, Louis was proclaimed "King of England" by rebellious barons in London, though never crowned. With the assistance of allies in England and Scotland he gained control of approximately one third of the English kingdom and part of Southern Wales. He was eventually defeated by English loyalists and those barons who swapped sides following the death of King John. After the Treaty of Lambeth, he was paid 10,000 marks, pledged never to invade England again, and was absolved of his excommunication.

As prince and fulfilling the crusading vow of his father, Philip II, Louis led forces during the Albigensian Crusade in support of Simon de Montfort the Elder, from 1219 to 1223, and as king, from January 1226 to September 1226. Crowned king in 1223, Louis's ordinance against Jewish usury, a reversal of his father's policies, led to the establishment of Lombard moneylenders in Paris.

The Priestly Fraternity of Saint Peter (Latin: Fraternitas Sacerdotalis Sancti Petri; FSSP) is a traditionalist Catholic society of apostolic life for priests and seminarians. It is in communion with the Holy See. It was founded in 1988 by 12 former members of the Society of Saint Pius X (SSPX) who left following the Écône consecrations, which resulted in the SSPX bishops being excommunicated by the Holy See.

Headquartered in Switzerland, the society maintains two international seminaries: the International Seminary of St. Peter in Wigratzbad-Opfenbach, Bavaria, Germany, and Our Lady of Guadalupe Seminary in Denton, Nebraska, United States. The society is officially recognized by the Holy See and has 368 priests who celebrate the Tridentine Mass in locations in 147 worldwide dioceses.