Please Note: The decisions made by this council which have no Scriptural foundation are found in underlined type below.
19th ecumenical council of the Roman Catholic church (1545-63), highly important for its sweeping decrees on self-reform and for its dogmatic definitions that clarified virtually every doctrine contested by the Protestants. Despite internal strife, external dangers, and two lengthy interruptions, the council played a vital role in revitalising the Roman Catholic church in many parts of Europe.
Though Germany demanded a general council following the excommunication of the German Reformation leader Martin Luther, Pope Clement VII held back for fear of renewed attacks on his supremacy. France, too, preferred inaction, afraid of increasing German power. Clement's successor, Paul III, however, was convinced that Christian unity and effective church reform could come only through a council. After his first attempts were frustrated, he convoked a council at Trent (northern Italy), which opened on Dec. 13, 1545.
Period I (1545-47): When an emotional crisis developed as the council opened (some urging immediate reform and others urging clarification of Catholic doctrines), a compromise was reached whereby both topics were to be treated simultaneously. The council then laid the groundwork for future declarations: the Niceno-Constantinopolitan Creed was accepted as the basis of Catholic faith; the canon of Old and New Testament books was definitely fixed; tradition was accepted as a source of faith; the Latin Vulgate was declared adequate for doctrinal proofs; the number of sacraments was fixed at seven; and the nature and consequences of original sin were defined. After months of intense debate, the council ruled against Luther's doctrine of justification by faith alone: man, the council said, was inwardly justified by co-operating with divine grace that God bestows gratuitously. By enjoining on bishops an obligation to reside in their respective sees, the church effectively abolished plurality of bishoprics. Political problems forced the council's transfer to Bologna and finally interrupted its unfinished work altogether.
Period II (1551-52): Before military events forced a second adjournment of the council, the delegates finished an important decree on the Eucharist that defined the Real Presence of Christ in opposition to the interpretation of Huldrych Zwingli, the Swiss Reformation leader, and the doctrine of transubstantiation (q.v.) as opposed to that of Luther. The sacrament of penancewas extensively defined, extreme unction (later, the anointing of the sick) explained, and decrees issued on episcopal jurisdiction and clerical discipline. German Protestants, meanwhile, were demanding a reconsideration of all the council's previous doctrinal decrees and wanted a statement asserting that a council's authority is superior to that of the pope.
Period III (1562-63): Pope Paul IV (1555-59) was opposed to the council, but it was reinstated by Pius IV (1559-65). The arrival of French bishops reopened the explosive question regarding the divine basis for the obligations of bishops to reside in their sees. When peace was restored, the council defined that Christ is entirely present in both the consecrated bread and the consecrated wine in the Eucharist but left to the pope the practical decision of whether or not the chalice should be granted to the laity. It defined the mass as a true sacrifice; issued doctrinal statements on holy orders, matrimony, purgatory, indulgences, and the veneration of saints, images, and relics; and enacted reform decrees on clerical morals and the establishment of seminaries.
Pius IV confirmed the council's decrees in 1564 and published a summary of its doctrinal statements; observance of disciplinary decrees was imposed under sanctions. In short order the catechism of Trentappeared, the missal and breviary were revised, and eventually a revised version of the Bible was published. By the end of the century, many of the abuses that had motivated the Protestant Reformation had disappeared, and the Roman Catholic church had reclaimed many of its followers in Europe. The council, however, failed to heal the schism that had sundered the Western Christian church -- Copyright 1994-1998 Encyclopaedia Britannica.