During his residence there he discovered on a rock near Nymphio a figure which he identified with the Sesostris of Herodotus.
In Herodotus' Histories there appears a story told by Egyptian priests about a Pharaoh Sesostris, who once led an army northward overland to Asia Minor, then fought his way westward until he crossed into Europe, where he defeated the Scythians and Thracians (possibly in modern Romania and Bulgaria).
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In Manetho, however, a pharaoh called Sesostris occupied the same position as the known pharaoh Senusret III of the Twelfth Dynasty, and his name is now usually viewed as a corruption of Senwosret.
Diodorus ascribes the erection of the first fort to rebel Assyrian captives in the reign of Sesostris, and Ctesias (Persica) dates it to the time of Semiramis; but Josephus (l. c.), with greater probability, attributes its structure to some Babylonian followers of Cambyses, in 525 BC.
William Whiston, a 17/18th century translator of the Antiquities, stated in a footnote that he believed Josephus mistook Seth for Sesostris, king of Egypt, the erector of the pillar in Siriad (being a contemporary name for the territories in which Sirius was venerated (i.e., Egypt).