(A.D. 440.)
Saint Sixtus III. was a native of Rome. He succeeded Celestin I.,
in 432, on the Papal throne. He laboured zealously to extinguish
the Pelagian and Nestorian heresies, and exhibited great joy at the
reconciliation between S. Cyril of Alexandria, and John, patriarch
of Antioch. Some epistles and some religious poems attributed to him
exist. He built and adorned many churches in Rome, and died August
18th, 440; and was succeeded by S. Leo the Great.