Pope Pius IX

Pius IX (1792–1878), born in Senigallia, was Pope from 16 June 1846 until his death in February 1878. He defined the dogma of the Immaculate Conception in December 1854.

The book

• Official Documents of the Definition of the Immaculate Conception 1855 In Latin and English

Sources: Wikidata, Wikipedia. Checked October 22, 2026.