List three important effects the Crusades had upon world history.​

the immediate geopolitical results of the crusades was the recapture of Jerusalem on 15 July 1099 CE, but to ensure the Holy City stayed in Christian hands it was necessary that various western settlements were established in the Levant (collectively known as the Latin East, the Crusader States or Outremer). For their defence, a steady supply of new crusaders would be needed in the coming decades and military orders of professional knights were created there such as the Knights Templar and Knights Hospitaller. These, in turn, inspired the formation of chivalric orders like the Order of the Garter in England (founded 1348 CE) which advocated the benefits of crusading on their members.

Despite the militarised presence in the Holy Land, the continued recruitment drive in Europe, and increased involvement of kings and emperors, it proved impossible to hold on to the gains of the First Crusade and more campaigns were required to recapture such cities as Edessa and Jerusalem itself after its fall again in 1187 CE. There would be eight official crusades and several other unofficial ones throughout the 12th and 13th centuries CE, which all met with more failure than success, and in 1291 CE the Crusader States were absorbed into the Mamluk Sultanate.

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