In 1280, victorious Teutonic Crusaders began building the world’s largest castle on a hill overlooking the River Nogat in what is now northern Poland. Malbork Castle became the hub of a powerful Teutonic state that crushed its pagan enemies and helped remake Medieval Europe. Now, ancient pollen samples show that in addition to converting heathens to Christians, the Crusaders also converted vast swathes of Medieval forests to farmlands.
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