Picture: Byzantine mosaicist, ca. 1000 · Public domain · Wikimedia Commons
Constantine the Great
Roman emperor from 306 to 337 and first to convert to Christianity (272–337)
SaintFull write-upAncient RomeDate unknown
Feast: 6 April (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
300
Died
337
verified
Beatified
—
not on record
Canonised
—
not on record
Who they were
Constantine, son of the Emperor Constantius and St Helena, was proclaimed emperor by his troops in 306. After his victory at the Milvian Bridge he granted toleration to Christian worship throughout the empire by the Edict of Milan in 313.
He was baptised shortly before his death in May 337.
The miracles
The Catholic Encyclopedia does not describe how he came to be honoured as a saint.
Why that counted as sanctity
The emperor who ended the persecution of the Church.
Connected on this site
- Constantina Saint Child“354), later known as Saint Constance, was the eldest daughter of Roman emperor Constantine the Great and his second wife Fausta, daughter of Emperor Maximian.” — Wikipedia
- Helena Augusta Saint Parent, Mother“AD 246/248 – 330), also known as Helena of Constantinople and in Christianity as Saint Helena, was a Greek Augusta of the Roman Empire and mother of Emperor Constantine the Great as well as a Canonized saint in both Catholic and Orthodox Churches for her pivotal role in the spread of Christianity.” — Wikipedia
- Eusebius of Nicomedia Saint“Although Constantine lived much of his life as a pagan, he later became a catechumen, as he began to favour Christianity in 312, finally being baptised by Eusebius of Nicomedia, an Arian bishop.” — Wikipedia
- Eusignius Saint“According to his hagiography he was born at Antioch and served in the imperial armies for about sixty years, beginning his career under the emperor Maximian and continuing through the reigns of Constantius Chlorus, Constantine the Great, and Constantine's sons.” — Wikipedia
- Hosius of Corduba Saint“After Lactantius, he was the closest Christian advisor to Emperor Constantine the Great and guided the content of public utterances, such as Constantine's Oration to the Saints, addressed to the assembled bishops.” — Wikipedia
- Metrophanes of Byzantium Saint“There is a tradition that the Roman emperor Constantine the Great bestowed upon him the honorary title of Patriarch; however, Byzantium did not become the capital of the Empire until 330 (when it was renamed Constantinople), and the see was not elevated to a patriarchate until 451.” — Wikipedia
- Miltiades Saint“It was during his pontificate that Emperor Constantine the Great issued the Edict of Milan (313), giving Christianity legal status within the Roman Empire.” — Wikipedia
- Nicetas the Goth Saint“His life spanned the years of Emperor Constantine the Great's sole rule (324–337 AD).” — Wikipedia
- Patricia of Naples Saint“Some sources say that she was a descendant of Constantine the Great.” — Wikipedia
- Reticius Saint“He traveled on behalf of Emperor Constantine the Great in 313 to the Synod of Rome and in 314 to the Synod of Arles, in order to bring about a resolution to the dispute with the Donatists.” — Wikipedia
Sources
- Catholic Encyclopedia (1913), via New Advent - Constantine the Great
- Wikidata Q8413 — dates, feast day and identifiers (CC0)
- English Wikipedia — Constantine the Great (CC BY-SA)
Checked against the sources listed on 21 September 2026. Corrections welcome.