New Catholic Dictionary – Pope Saint Sixtus III

detail of a bas-relief portrait medallion of Pope Saint Sixtus III, date and artist unknown; Saint Peter's Basilica, Rome, ItalyDerivation

  • Latin: semtus, the sixth


Reigned from 31 July 432 to 18 August 440. Born in Rome, Italy; died there on 18 August 440. During his pontificate he was falsely accused of favoring Nestorianism and Pelagianism, because of his conciliatory disposition during their controversies. He

  • approved of the Acts of the Council of Ephesus
  • defended the supremacy of the pope over Illyricum, against the local bishops and Proclus of Constantinople
  • restored the Basilica of Liberius
  • beautified Saint Peter’s, and the Lateran Basilica

Feast, 28 March.

MLA Citation

  • “Pope Saint Sixtus III”. New Catholic Dictionary. CatholicSaints.Info. 10 August 2018. Web. 20 September 2021. <>