Why did the Council of Trent formally affirm seven Roman Catholic sacraments?

The Council of Trent (1545–1563) formally affirmed the seven sacraments as a direct response to the doctrinal challenges posed by the Protestant Reformation.12

During the 16th century, Protestant reformers—most notably Martin Luther—challenged the traditional number and nature of the sacraments. Luther argued that a sacrament must be a rite explicitly instituted by Christ in Scripture, leading him to reduce the number of sacraments to two: baptism and the Eucharist.3

In contrast, the Council of Trent sought to clarify and consolidate Roman Catholic doctrine, which had faced significant ambiguity during the Middle Ages. By formally fixing the number of sacraments at seven—baptism, confirmation, the Eucharist, penance, holy orders, matrimony, and extreme unction—the Council reaffirmed these rites as having been instituted by Christ. This dogmatic definition served to reject Protestant interpretations and revitalize the Church’s theological identity during the Counter-Reformation.124