How many centuries did the era of the Crusades last?

The era of the Crusades lasted from four centuries. They began in the 11th century. At this time, there was not enough land in Europe, land plots were becoming smaller, and landless knights became more and more, so the Pope decided to introduce orders of liberation, which were supposed to liberate territories inhabited by adherents of the non-Catholic faith. The crusaders successfully coped with their task at first. Yer gradually their military capabilities declined, and the results of conquest campaigns were not. The last was in 1270.

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