There are questions History poses with brutal clarity, and this is one of them: could the medieval world have avoided the Crusades? For years, while building my saga La Historia de las Ocho Crociate, I was compelled to answer it not as a distant historian, but as a narrator inhabiting the skin of crusaders, Saracens, hermit monks and kings. And the answer, however uncomfortable, is always the same: no. The Crusades were inevitable.
The unbearable weight of Jerusalem
Before Peter the Hermit walked the roads of France and the Rhineland summoning crowds with his incendiary eloquence, Jerusalem was already far more than a city. It was the centre of the Christian spiritual universe, the place where Christ had died and risen, the convergence point of pilgrimage, promise and forgiveness. For medieval man, losing access to Jerusalem was not a geopolitical defeat: it was a wound in the soul of the world.
In La Cruzada de Pedro el Ermitaño, I tried to capture exactly that moment: the instant when collective fervour surpassed any rational consideration. Peter did not invent the outrage — he channelled it. And that is the hallmark of truly inevitable historical movements: a single man does not create them, he precipitates them.
The Europe that needed a war
The Crusades were not born solely from faith. They were also born from a Europe simmering from within. At the end of the eleventh century, the continent was a system on the brink of social collapse. The custom of primogeniture left thousands of younger sons without land, title or future. The warrior nobility found in internal warfare an outlet that devastated Christian Europe itself.
Urban II's preaching at Clermont was an act of social engineering of extraordinary lucidity: it took that accumulated destructive energy and redirected it toward an external objective charged with sacred meaning. "Dieu le veut" — God wills it. In three words, the pope transformed war into penance, violence into virtue, and armed vagrancy into pilgrimage.
An expanding Islam and fear as engine
On the other side of the Mediterranean, the Islamic world was living its own moment of fracture and expansion. The Seljuk Turks had defeated the Byzantine Empire at Manzikert (1071) with a decisiveness that shook the foundations of Eastern Christendom. Byzantium was now desperately appealing to the West for help.
In La Sangre de Jerusalén, I explored that fear from within: the fear of warriors who knew they might die, who probably would die, and who marched nonetheless. Not out of madness, but because the alternative — standing still while the world closed in — seemed even more unbearable.
Faith as a real historical force
The most common mistake when analysing the Crusades from a modern perspective is underestimating faith. Economic, political or psychological motivations are always sought, as if religious fervour were a mask concealing something more "real". But for medieval man, God was not a metaphor: He was the explanation of everything, the first cause and the ultimate destiny. The promise of plenary indulgence made perfect sense within a completely coherent belief system. If you genuinely believed in purgatory, sin, grace and divine intercession, then embarking on the Crusade was the most rational decision you could make.
The Mediterranean as a structural battlefield
There is a geopolitical dimension to the Crusades that transcends religion: the Mediterranean as an arena of inevitable competition between civilisations. Venice, Genoa and Pisa financed Crusades not out of spiritual fervour but because having bases in the Levant served their interests. In El Amanecer de los Templarios, that dimension becomes the protagonist: the Knights Templar are not only warriors of Christ; they are also bankers, administrators of logistical networks and political actors on a board that has nothing simple about it.
Inevitable, yes. Justified?
That the Crusades were inevitable does not mean they were just. History rarely produces phenomena that are both comprehensible and innocent. The massacres of Jews along the Rhine, the sack of Constantinople in 1204, the raw violence of the siege of Jerusalem in 1099: all of it belongs to the same movement, its glories and horrors inextricably intertwined.
As a novelist, my task is not to judge but to understand. The Crusades were inevitable because they were the product of everything Europe and Islam were at that moment. And that is, perhaps, the most unsettling lesson they leave us: that History's great catastrophes are not caused by monsters. They are caused by us, when we are perfectly ourselves.