Rome and the Eastern Churches
When East met West schism
Description
On July 16, 1054, three papal legates walked into the great church of Hagia Sophia in Constantinople during the liturgy and laid a document of excommunication on the altar. Their leader, Cardinal Humbert of Silva Candida, had come from Rome to settle a quarrel; instead he condemned the patriarch Michael Cerularius and swept out of the building. Cerularius, unimpressed, excommunicated the legates back a few days later. It is the scene every account reaches for when it wants to date the split between the Catholic West and the Orthodox East. It is dramatic, precise, and — as Fr. Aidan Nichols argues in his study of Rome and the Eastern Churches — almost entirely misleading about what actually happened.
Nichols, an English Dominican theologian, writes from inside the Catholic tradition, but he is not interested in scoring points. His subject is the long, tangled relationship between the see of Rome and the ancient Christian communities of the East — the Byzantines, and beyond them the Copts, the Syrians, the Armenians, churches whose own divisions from the imperial Church run centuries deeper than 1054. What he wants to recover is how slowly, how unevenly, and how much through misunderstanding as through doctrine, two halves of one Church came to stop recognizing each other.
It is a story that resists the clean line. The estrangement of East and West was not a single rupture but a drift — of language, liturgy, politics, and eventually theology — that took the better part of a millennium to harden, and that some of the parties involved barely noticed while it was happening. Nichols reads it as a Catholic looking for the roots of a reconciliation that has never quite arrived.
The question we’re asking : How did one Church, sharing the same creed and sacraments, drift into two that no longer share communion?What we’ll see : How Nichols traces a slow estrangement of language, doctrine, and authority — and why he refuses the tidy date the textbooks assign to it.
Table of contents
01Chapter 1 — The Church that breathed with two lungs
For its first several centuries, Christianity was not a Western religion with an Eastern branch, nor the reverse. It was a Mediterranean world of ancient sees — Rome, Alexandria, Antioch, Jerusalem, and then Constantinople — that held together through shared faith, shared sacraments, and a rough sense of who ranked where. Nichols is careful to establish this at the outset, because the whole book depends on it. The later split only reads as tragedy if we first grasp how genuinely one this Church was. There is an image, later made famous by John Paul II, of the Church breathing with two lungs, East and West. Nichols treats that not as sentiment but as historical description.
The two lungs were already different, though. The West spoke Latin, the East mostly Greek, and by the sixth and seventh centuries fewer and fewer people on either side could read the other's theologians in the original. Nichols keeps returning to this practical fact. A doctrine argued in Greek did not always survive the crossing into Latin with its shading intact, and vice versa. The great Church councils of the early centuries — Nicaea, Constantinople, Ephesus, Chalcedon — had been genuinely universal gatherings, hammering out the creed together. But even Chalcedon in 451 had already broken off communities that could not accept its language about Christ's two natures, and those churches — Coptic, Syriac, Armenian — went their own way long before Rome and Byzantium fell out.
02Chapter 2 — The words that pulled apart
The doctrinal fault lines, when Nichols lays them out, turn out to be surprisingly few and surprisingly deep. The most famous is a single Latin word: Filioque. The original creed said the Holy Spirit proceeds "from the Father." Over centuries the Western Church added "and from the Son" — Filioque — first in Spain, then across the Frankish lands, and eventually, over Rome's own long hesitation, in Rome itself. To Byzantine theologians this was a double scandal. It seemed to muddle the doctrine of the Trinity, and it had been inserted into a creed that a universal council had settled, apparently without the authority of another such council.
Nichols handles this with real care, because it is where a Catholic writer is most tempted to wave the difference away. He does not. He explains why the East heard the addition as an assault on the Father's unique role as the source within the Trinity, and why the West understood it as safeguarding the full divinity of the Son. Much of the heat, he suggests, came from the translation problem again: the Greek and Latin verbs for "proceed" did not carry identical weight, so each side could accuse the other of an error neither quite intended. The dispute was real, but part of it was two languages talking past each other.
03Chapter 3 — 1054 was not the day it happened
This is where Nichols is most bracing. The excommunications of 1054, he insists, did not create the schism. Humbert's bull condemned Cerularius personally, not the Eastern Church as such, and its legal standing was shaky — the pope who had sent him had died before the legates acted. Ordinary Christians on both sides carried on as before. Greeks and Latins went on sharing sacraments in places for generations afterward. If you had asked a Byzantine layman in 1100 whether his Church was in schism with Rome, he might not have known what you meant.
What actually hardened the division, Nichols argues, was the Crusades — above all the Fourth Crusade of 1204, when a Western army meant for Jerusalem instead sacked Constantinople, looted its churches, and installed a Latin patriarch on the Byzantine throne. Nothing in the theological quarrels had done as much damage as that betrayal. After 1204 the memory of the schism was no longer a matter of subtle disputes about a verb; it was the memory of Western knights stripping the altars of the greatest church in Christendom. Estrangement became something felt in the body, not just argued in the schools.
04Chapter 4 — What a divided Church says about unity
Step back from the dates and the quarrels, and the deeper thing Nichols is circling is what this whole history reveals about the nature of Christian unity. It is not, on the evidence, a fragile thing that snaps in a single moment. It is a living relationship that can be strained for centuries while both sides still believe they are one, and that can be formally repaired on paper while remaining broken in fact. Communion, in his telling, is something more than doctrinal agreement — it is trust, memory, shared worship, and a mutual willingness to recognize the other as the same Church. Any of those can go without the creed changing a syllable.
This is why he spends so much of the book on things that are not, strictly speaking, doctrine: language, liturgy, the sack of a city, the reception or rejection of a council by ordinary believers. The Rome-East estrangement was doctrinal, yes, but it was carried and hardened by culture. Two halves of one Church stopped being able to imagine themselves into each other's world, and once that imaginative link was gone, the doctrinal differences that had always existed became reasons to stay apart rather than problems to solve together.
05Conclusion
The scene in Hagia Sophia in 1054 keeps its place in the textbooks because it is vivid and easy to remember. Nichols does not ask us to forget it, only to see it for what it was — a bad-tempered episode between a legate and a patriarch, not the sundering of a Church. The real division came later and slower, through a crusade that turned a theological quarrel into a wound, through reunions that agreed on the words and foundered on the reception, through two civilizations that gradually lost the ability to read each other.