infill and impressed imitations of basketry. Lower Nubia was controlled by Egypt from 2000 to 1700 BC and Upper Nubia from 1700 to 1525 BC. From 2200 to 1700 BC, the Pan Grave culture appeared in Lower Nubia. Some of the people were likely the Medjay (mḏꜣ,) arriving from the desert east of the Nile river. One feature of Pan Grave culture was shallow grave burial. The Pan Grave and C-Group definitely interacted: Pan Grave pottery is characterized by more limited incised lines than the C-Group's and generally have interspersed undecorated spaces within the geometric schemes. Egypt in Nubia In 2300 BC, Nubia was first mentioned in Old Kingdom Egyptian accounts of trade missions. The Egyptians referred to Lower Nubia as Wawat, Irtjet, and Setju, while they referred to Upper Nubia as Yam. Some authors believe that Irtjet and Setju could also have been in Upper Nubia. They referred to Nubians dwelling near the river as Nehasyu. From Aswan, the southern limit of Egyptian control at the time, Egyptians imported gold, incense, ebony, copper, ivory, and exotic animals from tropical Africa through Nubia. Relations between the Egyptians and Nubians showed peaceful cultural interchange, cooperation, and mixed marriages. Nubian bowmen that settled at Gebelein during the First Intermediate Period married Egyptian women, were buried in Egyptian style, and eventually could not be distinguished from Egyptians. Older scholarship noted that some Egyptian pharaohs may have had Nubian ancestry. Richard Loban expressed the view that Mentuhotep II of the 11th Dynasty "was quite possibly of Nubian origin" and cited historical evidence which mentioned that Amenemhet I, founder of the 12th Dynasty, "had a Ta Seti or Nubian mother". Deitrich Wildung has argued that Nubian features were common in Egyptian iconography since the pre-dynastic era and that several pharaohs such as Khufu and Mentuhotep II were represented with these Nubian features. Frank Yurco wrote that "Egyptian rulers of Nubian ancestry had become Egyptians culturally; as pharaohs, they exhibited typical Egyptian attitudes and adopted typical Egyptian policies". Yurco noted that some Middle Kingdom rulers, particularly some pharaohs of the Twelfth Dynasty had strong Nubian features, due to the origin of the dynasty in the Aswan region of southern Egypt. He also identified the pharaoh Sequenre Tao of the Seventeenth Dynasty, as having Nubian features. Many scholars in recent years have argued that the mother of Amenemhat I, founder of the Twelfth Dynasty was of Nubian