These changes in defence have been attributed to a mixture of castle technology from the Crusades, such as concentric fortification, and inspiration from earlier defences, such as Roman forts.
Əsimutuyan wən nuguz igan asirtay ən timusnawen tən nenuwan ədosanen dǎɣ tanmirtayt, sund asusuhu namas, əd tarha nuguz ta taruwat, sund wi asohatnen romaintan.