In Christian theology, traducianism is a doctrine about the origin of the soul (or synonymously, "spirit"), in one of the biblical uses of word to mean the immaterial aspect of human beings (Genesis 35:18, Matthew 10:28). Traducianism means that this immaterial aspect is transmitted through natural generation along with the body, the material aspect of human beings. That is, an individual's soul is derived from the souls of the individual's parents. This implies that only the soul of Adam was created directly by God (with Eve's substance, material and immaterial, being taken from out of Adam), in contrast with creationism (not to be confused with creationism as a belief about the origin of the material universe), which holds that all souls are created directly by God (with Eve's substance, material and immaterial, being taken from out of Adam).

The Church Fathers universally agreed that the soul of Adam was directly created by God. Tertullian actively advocated traducianism (that is, the parental generation of souls), while some of the later Fathers — most notably Saint Augustine, at the outbreak of Pelagianism — began to question the creation by God of individual souls and to incline to the opposite opinion, which seemed to facilitate the explanation of the transmission of original sin. Thus, writing to St. Jerome, St. Augustine said, "If that opinion of the creation of new souls is not opposed to this established article of faith let it be also mine; if it is, let it not be thine." Theodorus Abucara, Macarius, and Gregory of Nyssa also favored this view.

Blessed Pope Pius IX (13 May 1792 – 7 February 1878), born Giovanni Maria Mastai-Ferretti, was the longest-reigning elected Pope in the history of the Catholic Church, serving from 16 June 1846 until his death, a period of nearly 32 years. During his pontificate, he convened the First Vatican Council in 1869, which decreed papal infallibility. The Pope defined the dogma of the Immaculate Conception of the Blessed Virgin Mary, meaning that Mary was conceived without original sin. Pius IX also granted the Marian title of Our Mother of Perpetual Help, a famous Byzantine icon from Crete entrusted to the Redemptorist priests. In addition to this, Pius IX was also the last Pope to rule as the Sovereign of the Papal States, which fell completely to Italian nationalist armies by 1870 and were incorporated into the Kingdom of Italy. He was beatified in 2000.