Clarification: Gallicanism was NOT the idea that the Church is subservient to the state in matters of doctrine; it is the idea that local bishops must accept a papal doctrine for it to be valid, which led to the state attempting to manipulate its bishops on a mass scale.

In part twenty two of this series about the ecumenical councils according to the Catholic Church, Will Deatherage examines the First Vatican Council, which defined the pope's ability to proclaim doctrines infallibly.