Following the very short reign of Nehesy, most scholars–among them, Manfred Bietak and Kim Ryholt–agree that the Delta region was struck by a prolonged famine and perhaps a plague lasting until the end of the 14th Dynasty. The same famine may have affected the 13th Dynasty, which also exhibits instability and numerous ephemeral kings in its last 50 years of existence, from c. 1700 BC until 1650 BC. The weakened state of both kingdoms may explain, in part, why they fell rapidly to the emerging Hyksos power c. 1650 BC.