Skip to main content
Select Source:

Leo I, Saint (pope)

Saint Leo I (Saint Leo the Great), c.400–461, pope (440–61), an Italian; successor of St. Sixtus III. A Doctor of the Church, he was one of the greatest pontiffs of the early years of the church. He waged a firm campaign against schism and heresy. With the aid of Valentinian III, the Roman emperor of the West, he campaigned to eliminate Manichaeism from Italy. Later, asserting his authority over St. Hilary of Arles, he obtained an imperial rescript that effectively confirmed the authority of the pope over all his bishops. In the Nestorian-Monophysite controversy Leo was the leader in defending Catholic teaching. He wrote the celebrated Tome of Leo, a doctrinal letter defining the two natures and one person of Christ that was later adopted as ecumenical at Chalcedon (see Chalcedon, Council of), when the heresiarch Eutyches was condemned. He was also effective as a statesman and met (452) Attila the Hun to persuade him not to invade Rome. In 455 he similarly urged Gaiseric the Vandal to spare the lives of the Romans. St. Leo's letters and sermons reflect the many aspects of his career and personality, including his great personal influence for good, and are invaluable historical sources. His rhythmic prose style, called cursus leonicus, influenced ecclesiastical language for centuries. The celebrated Leonian Sacramentary, the oldest form of the Roman Missal, is probably not his work. He was succeeded by St. Hilary. Feast: Apr. 11.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Leo I, Saint (pope)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 16 Sep. 2018 <http://www.encyclopedia.com>.

"Leo I, Saint (pope)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 16, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/leo-i-saint-pope

"Leo I, Saint (pope)." The Columbia Encyclopedia, 6th ed.. . Retrieved September 16, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/leo-i-saint-pope

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

Leo I, St

Leo I, St, known as ‘ Leo the Great’ (d. 461). Pope from 440, who worked to enhance the pre-eminence of the see of Rome, claiming jurisdiction in Africa, Spain, and Gaul. Leo composed his Tome, expounding the Christology of the Latin Church, according to which Jesus Christ is one person, the divine Word, in whom are two unconfused natures, the divine and human; each of these exercises its own particular faculties, but because of the communicatio idiomatum it may be said that the Son of Man descended from heaven, and the Son of God was crucified. The Tome was given formal authority at the Council of Chalcedon in 451. Leo was declared a Doctor of the Church by Benedict XIV.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Leo I, St." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. 16 Sep. 2018 <http://www.encyclopedia.com>.

"Leo I, St." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (September 16, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/leo-i-st

"Leo I, St." The Concise Oxford Dictionary of World Religions. . Retrieved September 16, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/leo-i-st

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.

Leo I, Saint

Leo I, Saint (390–461) (Leo the Great) Pope (440–61). He established important points of doctrine, including the dual nature of Christ, which he propounded at the Council of Chalcedon (449). By personal meetings, he saved Rome from Attila (452) and the Vandal leader Gaiseric (455).

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"Leo I, Saint." World Encyclopedia. . Encyclopedia.com. 16 Sep. 2018 <http://www.encyclopedia.com>.

"Leo I, Saint." World Encyclopedia. . Encyclopedia.com. (September 16, 2018). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/leo-i-saint

"Leo I, Saint." World Encyclopedia. . Retrieved September 16, 2018 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/leo-i-saint

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.