Not yet confirmedUnder investigation. Here is what is known and what still needs proof.
Archaeologists from Ca’ Foscari University of Venice say they have located the probable church of the bishop of ancient Altino, in northern Italy, along with what they believe was his residence. The university announced the find on Oct. 15, based on excavations in September and October 2026 combined with evidence gathered in 2025.
Here is the real size of the story. It is a university announcement of a proposed identification, which the team itself calls probable. I found no published scientific paper and no public comment from a specialist outside the project. The Christian Post report, which circulated under the line “known only through letters,” follows the press release closely and offers no independent voice.
A hall 98 feet by 66 under the Via Sant’Eliodoro
The building is a rectangular hall of about 30 by 20 meters, with no apse, facing east, founded between the late fourth and the first half of the fifth century. It stands almost opposite the old Altino museum, in an Augustan-era neighborhood reorganized as an early Christian quarter along the road to the harbor gate and the Sioncello canal. According to the release, the provincial road that bears the name of St. Eliodoro, the Italian form of Heliodorus, cuts through the middle of the church.
On the east side, the team found a large porticoed building with internal partition walls and annexes, which it proposes to read as the bishop’s palace. The heavy foundations suggest two stories: clergy quarters above and, on the ground floor, perhaps privileged burials for bishops or notables, as remains of late antique mosaics suggest. The baptistery has not been found.
One detail stands out. The foundations reuse paving stones from Roman roads, made of trachyte, a hard volcanic rock, and laid upside down. Roman law protected roads as public infrastructure, and the researchers read the reuse as a sign that the bishop held considerable public authority in the city.
What Jerome wrote to Heliodorus in 396
The church enters history through a letter. Jerome’s Letter 60 consoles his old friend Heliodorus, then bishop of Altinum, over the death of his nephew Nepotian, who died of a fever. The English translation at New Advent dates it to AD 396.
Heliodorus was no stranger to Jerome. He had been a soldier and belonged to a circle of friends gathered at Aquileia around 372 to study Scripture and practice asceticism, a group that included Jerome and Chromatius. He went with Jerome on his first trip east, then returned to become bishop of Altinum and attended the Council of Aquileia in 381.
In praising the nephew, Jerome describes the young presbyter’s care for the church: the altar kept bright, the walls free of soot, the pavement swept, the door curtains in place, the vessels shining. The text names the altar, walls, floors, doors and sacred vessels. The letter also says Nepotian decorated the basilicas of the church and the halls of the martyrs with sketches of flowers, foliage and vine tendrils. To make the point, Jerome reaches for Bezalel, the craftsman of the tabernacle in Exodus 31:2-3.
So the letter confirms that Altino had a bishop, clergy and buildings for worship. One summary of Altino’s history notes that it mentions several churches and martyr shrines. It gives no plan, no measurements and no location, and that is where the identification meets its limit.
How the team found it: robber trenches and recycled road stones
Altino was erased twice. Industrial agriculture stripped the upper layers, and the systematic removal of bricks and stone fed building projects at Torcello and Venice. Standing walls are rare. What survives are the trenches dug to pull out building material, which preserve the outline of a vanished structure like a negative impression.
The hypothesis grew out of a review of Roman and late antique data by field supervisors Jacopo Paiano and Eleonora Delpozzo, working from the archaeological park’s archives. Parts of the complex had surfaced in excavations in the 1980s and earlier, and the team says it linked the scattered evidence through a broader analysis of the foundations and the layers beneath them.
The date rests on material recovered from the robber trenches and on an assessment of the surrounding neighborhood. As far as the release states, the building itself has no radiocarbon date yet. A sixth- and seventh-century portico and a cemetery of brick-lined graves lie in front of the façade. Barbara Bramanti of the University of Ferrara is studying the human remains, and Francesca Mombelli of the University of Salento is studying the pottery.
Where the headline stretches the facts
The line “church known only from letters, now identified” sounds firmer than the evidence allows. Four points are worth weighing.
First, the verb. The university says it has identified the church with a very high degree of probability. Excavation director Diego Calaon said: “Written sources told us they must have existed; now we have archaeological evidence to support this.” The Christian Post’s own photo caption goes further than the rest of the story, saying the building would likely be the first church in the Venetian Lagoon if the fifth-century chronology is confirmed.
Second, nothing found so far names the building. The reading as an episcopal church comes from its size, its eastward orientation, its place in the neighborhood and its date.
Third, the date range is wide. Foundation falls between the late fourth century and the first half of the fifth. Jerome wrote in 396. The building may be the one he knew, but it may also postdate him or have replaced an earlier church.
Fourth, earlier scholarship was cautious. An older academic paper on Altino using digital terrain models wrote that only hypotheses could be made about the location of the episcopal center, and suspected the remains might have been lost to modern farming. The 2026 dig changes that picture, but as a proposal still to be tested.
Co-director Elisa Possenti of the University of Trento says the find will help reassess Altino’s earliest bishops, whose stories are largely shrouded in legend. Marianna Bressan, who directs the National Archaeological Museums of Venice and the Lagoon, is an institutional partner in the project and so does not count as an independent voice.
From Altino to Torcello: a planned move, not a flight
The release leans on a second conclusion. Tradition says Altino’s nobles fled barbarian invasions. Ca’ Foscari’s excavations at Torcello show that the island served as Altino’s port, where a new religious building went up in the seventh century. To the team, the move of the bishop’s seat looks like a deliberate decision driven mainly by demographic and environmental factors, with the Altino church taken apart piece by piece by the first half of the seventh century.
That fits, the archaeologists say, with the Torcello inscription of 639. By an ancient inscription, Torcello’s cathedral was founded by the exarch Isaac of Ravenna in 639. Calaon calls the process a long, managed transformation rather than a sudden flight. It is the team’s historical reading, anchored in Torcello, and it depends on the Altino church really being the episcopal one.
What this means for readers of the Bible, and what comes next
The New Testament does not speak of cathedrals. The earliest congregations met in homes, as in Romans 16:5 and Philemon 1:2, and the word “church” in Matthew 16:18 means people, not a building. Overseers, the episkopoi, appear in Philippians 1:1, 1 Timothy 3:1-7 and Titus 1:5-9 as leaders of local communities. In Altino at the end of the fourth century the picture is different: a bishop with a palace, resident clergy and the clout to dig up Roman roads. If confirmed, the find shows that shift in stone.
There is also a link to the biblical text itself. Heliodorus and Chromatius followed Jerome from afar. They took a warm interest in his translation of the Scriptures and wrote often, urging him to finish the work. The Vulgate, in other words, owes a little to Altino. In Letter 60, Jerome builds his consolation on passages such as 1 Thessalonians 4:13 and John 11:11, which treat death as sleep.
As for what comes next, the release lists systematic analysis of the finds and the human remains, radiocarbon dating, and geophysical surveys in the unexcavated parts of the city block, in search of the baptistery and the rest of the complex. Those results will show whether the building’s date comes close to 396 and how many people were buried there. Only then can people outside the dig weigh the hypothesis.
The known timeline is short. Around 372 the Aquileia circle forms. In 381 Heliodorus attends the council. In 396 Jerome writes Letter 60. Between the late fourth and early fifth century, per the team, the church goes up. In the sixth and seventh centuries a portico and cemetery are added. By the first half of the seventh century the building is dismantled. In 639 the Torcello inscription is carved. In the 1980s parts of the complex surface without being recognized. In 2025 and 2026 the data review and new campaigns lead to the hypothesis announced in October.
Ca’ Foscari announced on Oct. 15, 2026 a rectangular hall of about 30 by 20 meters, with no apse, facing east, with foundations from the late fourth or first half of the fifth century.
Beside it stands a large porticoed building, read as the probable bishop’s palace, with foundations made from recycled Roman road stones.
Jerome’s Letter 60, from 396, concerns Heliodorus, bishop of Altinum, and his nephew Nepotian’s care for the church.
What we don't know yet
Whether this is the same building Jerome knew: the date range runs into the fifth century and no find names the church.
Where the baptistery is and what the full plan of the complex looked like.
How many people were buried there and what the radiocarbon dates say, since that work is still ahead.
How specialists outside the team judge the hypothesis, since no paper has been published.
