Will someone define "Mage/Templar Conflict end" please?
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Periodization is a retroactively imposed intersubjective cognitive construct. It is not objective; it is not "wie es eigentlich gewesen".
When did the American Civil War end? Was it on 9 April 1865, when the Army of Northern Virginia's leadership signed documents of surrender? Or was it on 26 April 1865, when the leadership of the Army of Tennessee surrendered to federal forces? The last formal military surrender of any Confederate unit was that of the raiding vessel CSS Shenandoah, which surrendered to British authorities in Liverpool on 6 November 1865. Would that date be best? But military operations against partisan forces in the southern United States continued into the 1870s - and some of those partisan organizations still exist today, albeit in somewhat altered form.
Politically, President Andrew Johnson issued a proclamation declaring a end to the state of rebellion on 2 April 1866. One might choose that date instead. But economically, culturally, and politically, the American Civil War cast a longer shadow. In many ways, the South was still feeling the effects of Federal destruction of infrastructure into the 1930s. The Solid South, a relic of secession-era politics, persisted for a century. In the 1960s, American antisegregation activists repeatedly made claims to the effect that the Civil War was not yet over, and that they were continuing the work of those who fought against secession a hundred years before. It didn't end - it just mutated into a different form.
Claiming that the American Civil War ended in the spring of 1865 is like claiming that the Iraq War ended in the spring of 2003. You can certainly make an argument for it, but that argument is not objective and there are plenty of excellent reasons to argue against it. That's true of setting any end date for anything. It's more of a reflection of the person setting the end date, and the sort of point that that person wants to make, than it is a reflection of what actually happened.
Defining who 'wins' a mage-templar conflict might be awfully fraught. It may depend on what end date one chooses; maybe a few decades or centuries later, the losing side stages a comeback of some kind and tries to overthrow whatever system the current conflict leaves in place. Whether you call that a second war or a truce is entirely subjective. Maybe things change after the conflict without 'open war'. It's hard for me to imagine a scenario for any mage-templar conflict that leaves a system that can't and won't be destroyed somehow.