The descriptions provided by the early Arab authors lack sufficient detail to pinpoint the exact location of the town. In fact, the sources appear contradictory with al-Idrisi placing the town on both sides of the Niger River. This has led to the suggestion that at some point the capital may have been moved south to the Niger River. The much later 17th-century African chronicle, the "Tarikh al-fattash", states that the Malian Empire was preceded by the Kayamagna dynasty which had a capital at a town called Koumbi. The chronicle does not use the word Ghana. The other important 17th-century chronicle, the "Tarikh al-Sudan" mentions that the Malian Empire came after the dynasty of Qayamagha which had its capital at the city of Ghana. It is assumed that the "Kayamagna" or "Qayamagha" dynasty ruled the empire of Ghana mentioned in the early Arabic sources.