With their growing wealth, at one time the Templar owned pretty much everything in Jerusalem.
By investing their money in outside ventures, from farms to textile they began to make a massive profit. With the return from these investments, they would buy up massive amounts of land which included the whole island of Cyprus.
Since in order to become a Templar one would have to give up all material wealth, all the money was reinvested back into the organization rather than spread about to individual Templar.
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