Declining power of the Middle Kingdom
Senusret's successor Amenemhat III reaffirmed his predecessor's foreign policy. However, after Amenemhat, the energies of this dynasty were largely spent, and the growing troubles of government were left to the dynasty's last ruler, Sobekneferu, to resolve. Amenemhat was remembered for the mortuary temple at Hawara that he built, known to Herodotus, Diodorus, and Strabo as the "Labyrinth". Additionally, under his reign, the marshy Fayyum was first exploited. Sobekneferu a daughter of Amenemhat III, was left with the unresolved governmental issues that are noted as arising during her father's reign when she succeeded Amenemhat IV, thought to be her brother, half brother, or stepbrother. Upon his death, she became the heir to the throne because her older sister, Neferuptah, who would have been the next in line to rule, died at an early age. Sobekneferu was the last king of the twelfth dynasty. There is no record of her having an heir. She also had a relatively short reign and the next dynasty began with a shift in succession, possibly to unrelated heirs of Amenemhat IV.