Sonbef, have been identified as possible sons of his based on their shared nomen 'Amenemhat'. As such, Sobekneferu may have usurped the throne after Amenemhat IV's death, viewing his heirs as illegitimate. Female Kingship Sobekneferu was one of the few women that ruled in Egypt, and the first to adopt the full royal titulary, distinguishing herself from any prior female rulers. She was also the first ruler associated with the crocodile god Sobek by name, whose identity appears in both her birth and throne names. Kara Cooney views ancient Egypt as unique in allowing women to acquire formal – and absolute – power. She posits that women were elevated to the throne during crises to guide the civilization and maintain social order. Though, she also notes that, this elevation to power was illusory. Women acquired the throne as temporary replacements for a male leader; their reigns were regularly targeted for erasure by their successors; and overall, Egyptian society was oppressive to women. In ancient Egyptian historiography, there is some evidence for other female rulers. As early as the First Dynasty, Meritneith is proposed to have ruled as regent for her son. In the Fifth Dynasty, Setibhor may have been a female king regnant based on the manner her monuments were targets for destruction. Another candidate, Nitocris, is generally considered to have ruled in the Sixth Dynasty, though there is little proof of her historicity and she is not mentioned before the Eighteenth Dynasty. The kingship of Nitocris may instead be a Greek legend and that the name originated with an incorrect translation of Neitiqerty Siptah. Reign The Middle Kingdom was in decline by the time of Sobekneferu's accession. The peak of the Middle Kingdom is attributed to Senusret III and Amenemhat III. Senusret III formed the basis for the legendary character Sesostris described by Manetho and Herodotus. He led military expeditions into Nubia and into Syria-Palestine and built a tall mudbrick pyramid as his monument. He reigned for 39 years, as evidenced by an inscription in Abydos, where he was buried. Amenemhat III, in contrast, presided over a peaceful Egypt that consisted of monumental constructions, the development of Faiyum, and numerous mining expeditions. His reign lasted at least 45 years, probably longer. He built two pyramids, at Dahshur and at Hawara. Nicolas Grimal notes that such long reigns contributed to the end of the Twelfth Dynasty, but without the collapse