# Immaculate Conception defined (1854)

URL: https://christianity-history.com/timeline/1854-immaculate-conception-defined
Location: Rome
Themes: Theology

Pope Pius IX defines the dogma of the Immaculate Conception. At this point in the timeline (8 December 1854), the Bishop of Rome was Pope Pius IX (16 June 1846 – 7 February 1878).

## Why it matters
Immaculate Conception defined mattered because it shaped how Christians understand God, Christ, salvation and the church.

Pope at the time: [Pope Pius IX](https://christianity-history.com/popes/pope-pius-ix)

## Sources
- [Wikipedia — Ineffabilis Deus](https://en.wikipedia.org/wiki/Ineffabilis_Deus)
- [Encyclopaedia Britannica topic lookup — Immaculate Conception defined](https://www.britannica.com/search?query=Immaculate+Conception+defined)
- [Wikipedia — Enlightenment and Revival (period overview)](https://en.wikipedia.org/wiki/History_of_Christianity#Modern_era)