Such are the gaps in the knowledge of the 14th Dynasty, that its absolute chronological position is debated and varies by as much as 75 years among authorities. Egyptologist Kim Ryholt proposes that the 14th Dynasty emerged during the late 12th Dynasty, c. 1805 BC, during or shortly after Sobekneferu's rule. He contends that the local Canaanite population residing in the eastern Delta declared its independence and staved off possible attempts from the 13th Dynasty Memphite kings to recover the Delta. According to Ryholt, the 14th Dynasty thus lasted from 1805 BC until its demise under the Hyksos 15th Dynasty, c. 1650 BC, i.e. lasting 155 years.