Held in four sessions over the course of three years, the Second Vatican Council was a meeting of Catholic Church leaders with the announced purpose of reconsidering the position of the church in the modern world. Among many other changes, the council reformed the liturgy, permitting the use of the vernacular language, rather than Latin. Representatives from non-Catholic churches were invited to observe the sessions. What unexpected event nearly ended the council prematurely? Discuss
Source: The Free Dictionary