AD. The description of the rug's design by al-Tabari makes it seem unlikely that the carpet was pile woven. Fragments of pile rugs from findspots in north-eastern Afghanistan, reportedly originating from the province of Samangan, have been carbon-14 dated to a time span from the turn of the second century to the early Sasanian period. Among these fragments, some show depictions of animals, like various stags (sometimes arranged in a procession, recalling the design of the Pazyryk carpet) or a winged mythical creature. Wool is used for warp, weft, and pile, the yarn is crudely spun, and the fragments are woven with the asymmetric knot associated with Persian and far-eastern carpets. Every three to five rows, pieces of unspun wool, strips of cloth and leather are woven in. These fragments are now in the Al-Sabah Collection in the Dar al-Athar al-Islamiyyah, Kuwait. The carpet fragments, although reliably dated to the early Sasanian time, do not seem to be related to the splendid court carpets described by the Arab conquerors. Their crude knots incorporating shag on the reverse hints at the need for increased insulation. With their coarsely finished animal and hunting depictions, these carpets were likely woven by nomadic people. The advent of Islam and the Caliphates: 651–1258 The Muslim conquest of Persia led to the end of the Sasanian Empire in 651 and the eventual decline of the Zoroastrian religion in Persia. Persia became a part of the Islamic world, ruled by Muslim Caliphates. Arabian geographers and historians visiting Persia provide, for the first time, references to the use of carpets on the floor. The unknown author of the Hudud al-'Alam states that rugs were woven in Fārs. 100 years later, Al-Muqaddasi refers to carpets in the Qaināt. Yaqut al-Hamawi tells us that carpets were woven in Azerbaijān in the thirteenth century. The great Arabian traveller Ibn Battuta mentions that a green rug was spread before him when he visited the winter quarter of the Bakhthiari atabeg in Idhej. These references indicate that carpet weaving in Persia under the Caliphate was a tribal or rural industry. The rule of the Caliphs over Persia ended when the Abbasid Caliphate was overthrown in the Siege of Baghdad (1258) by the Mongol Empire under Hulagu Khan. The Abbasid line of rulers recentered themselves in the Mamluk capital of Cairo in 1261. Though lacking in political power, the dynasty continued to claim authority