After the initial dynastic chaos, a series of longer reigning, better attested kings ruled for about fifty to eighty years.[1] The strongest king of this period, Neferhotep I, ruled for eleven years and maintained effective control of Upper Egypt, Nubia, and the Delta,[58] with the possible exceptions of Xois and Avaris.[59] Neferhotep I was even recognized as the suzerain of the ruler of Byblos, indicating that the Thirteenth Dynasty was able to retain much of the power of the Twelfth Dynasty, at least up to his reign.[59] At some point during the 13th Dynasty, Xois and Avaris began governing themselves,[59] the rulers of Xois being the Fourteenth Dynasty, and the Asiatic rulers of Avaris being the Hyksos of the Fifteenth Dynasty. According to Manetho, this latter revolt occurred during the reign of Neferhotep's successor, Sobekhotep IV, though there is no archaeological evidence.[60] Sobekhotep IV was succeeded by the short reign of Sobekhotep V, who was followed by Wahibre Ibiau, then Merneferre Ai. Wahibre Ibiau ruled ten years, and Merneferre Ai ruled for twenty three years, the longest of any Thirteenth Dynasty king, but neither of these two kings left as many attestations as either Neferhotep or Sobekhotep IV.