After Saladin captured Aleppo he completed the conquest of Muslim Syria but he failed to take over the Zengid stronghold of Mosul.
Some benefits the Crusaders had even though they were not successful were that they increased the authority of the king and kings passed taxes to pay for the crusades.
The way the economic system changed in Europe is the the population began rising, technology began changing, more farming improvements, and trade began improving.
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