Peter's Rock in Mohammed's Flood, from St. Gregory the Great to St. Leo III

(9 User reviews)   2023
By Abil Kile Posted on Nov 15, 2025
In Category - History
Allies, T. W. (Thomas William), 1813-1903 Allies, T. W. (Thomas William), 1813-1903
English
Ever wondered how Christianity survived the dramatic rise of Islam? This book isn't about battles and swords, but about something much deeper: a massive, centuries-long conversation. It follows the intellectual struggle of Christian leaders, from Pope Gregory the Great to Pope Leo III, as they tried to make sense of their faith in a world suddenly transformed. The author, T.W. Allies, takes you right into the minds of these pivotal figures as they grapple with a new religious power and fight to preserve their identity. It’s a surprisingly human look at a pivotal clash of civilizations, told from the inside out. If you like history that feels immediate and personal, this one will grab you.
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PROLOGUE TO THE SEVEN VOLUMES OF THE FORMATION OF CHRISTENDOM. This work being from the beginning one in idea, I place here together the titles of the fifty-six chapters composing it. For each of these was intended to be complete in itself, so far as its special subject reached; but each was likewise to form a distinct link in a chain. The Church of God comes before the thoughtful mind as the vast mass of a kingdom. Its greatest deeds are but parts of something immeasurably greater. The most striking evidence of its doctrines and of its works is cumulative. Those who do not wish to let it so come before them often confine their interest in very narrow bounds of time and space. Thus I have known one, who thought himself a bishop, accept Wycliffe as the answer of a child to his question, Who first preached the Gospel in England? And not only this. They also seize upon a particular incident, or person, and so invest with extraordinary importance facts which they suppose, and which so conceived are convenient for their purpose, but in historical truth are anything but undisputed. In this tone of mind, or shortness of vision, that which is gigantic becomes puny, that which is unending becomes transient. The sequel and coherence of nations, the mighty roll of the ages spoken of by St. Augustine, are lost sight of. Again, in English-speaking countries alone more than two hundred sects call themselves Christian. Their enjoyment of perfect civil freedom and equality veils to them the horror of doctrinal anarchy, in virtue of which alone they exist. By this anarchy the very conception of unity as the corollary of truth is lost to the popular mind. But through the eight centuries of which I have treated, the loss of unity was the one conclusive test of falsehood, and the Christian Faith stood out to its possessors with the fixed solidity of a mountain range whose summit pierced the heaven. It has been my purpose to exhibit the profound unity of the Christian Faith together with the infinite variety of its effects on individual character, on human society, on the action of nations towards each other, on universal as well as national legislation. Like the figure of the great Mother of God bearing her Divine Son in her arms, and so including the Incarnation and all its works, the Faith stands before us in history, “veste deaurata, circumdata varietate”. And as the personal unity appears in the symbol of the Divine Love to man expressed in her Maternity, so it appears also in the figure of the Church through the ages in which that Divine Love executes His work. A divided creed means a marred gospel and an incredulous world. I offer this work as a single stone, though costing the labour of thirty years, if perchance it may be accepted in the structure of that Cathedral of human thought and action wherein our Crucified God is the central figure, around which all has grown. Be it allowed me to quote here words of the present Sovereign Pontiff addressed on the 18th August, 1883, to the Cardinals de Luca, Pitra, and Hergenröther:— “It is the voice of all history that God with the most careful providence directs the various and never-ending movements of human affairs. Even against man’s intention he makes them serve the advancement of His Church. History says further that the Roman Pontificate has ever escaped victorious from its contests and the violence employed against it, while its assaulters have failed in the hope which they...

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The Story

This book picks up the story in the 6th century, just as the world of the old Roman Empire is changing forever. It follows a line of key Christian leaders, starting with Pope Gregory the Great. The narrative shows how these men witnessed the rapid spread of Islam and had to figure out what it meant for their faith and their people. The 'rock' is the enduring foundation of Christian belief, and the 'flood' is the overwhelming new reality of Islamic expansion. The book tracks their responses—through letters, theological arguments, and church policies—as they worked to hold their community together against what felt like a tidal wave of change.

Why You Should Read It

What makes this book special is its focus on the human reaction to history. We often learn about these eras as lists of dates and edicts. Allies makes you feel the confusion, the fear, and the stubborn determination of these leaders. You see them not as distant saints in stained glass, but as real people trying to solve an impossible problem. It completely reframes this period from a simple military conflict into a profound intellectual and spiritual crisis. It helped me understand that the real story was happening in the minds and hearts of those trying to lead, not just on the battlefield.

Final Verdict

This is a perfect pick for readers who love deep-dive history but want to avoid dry textbooks. It’s for anyone curious about the roots of the Christian-Muslim relationship and how great historical shifts play out in the thoughts of individuals. Be prepared for a thoughtful, dense read—it’s not a light novel. But if you’re willing to engage with it, you’ll come away with a much richer, more personal understanding of a world in transition.



📢 Open Access

This digital edition is based on a public domain text. Preserving history for future generations.

Daniel Hill
3 months ago

I started reading out of curiosity and the storytelling feels authentic and emotionally grounded. This story will stay with me.

Kenneth Rodriguez
7 months ago

Fast paced, good book.

Dorothy Williams
3 months ago

Essential reading for students of this field.

Oliver White
5 months ago

Without a doubt, the atmosphere created is totally immersive. Thanks for sharing this review.

4.5
4.5 out of 5 (9 User reviews )

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