Beginning in the 13th century, Khmer's relations with the Siamese were difficult and bitter, resulting in rivalry and hostility for centuries. Siamese Sukhothai revolted from the empire's suzerainty in 1238. In August 1296, Zhou Daguan recorded that in the recent war with the Siamese, the country was utterly devastated. This report confirmed that by the late 13th century, the Siamese warlords had revolted and disrupted the Khmer empire's hegemony, starting Siam's rise. By the 14th century, the Siamese Ayutthaya Kingdom became the Khmer empire's formidable rival, as Angkor was besieged and captured twice by Ayutthayan Siamese invaders in 1353 and 1394.