Although co-regencies have been acknowledged in Egyptian history, it has been difficult to pinpoint evidence in support of them and little work has been carried out on the Middle Kingdom rulers. Here, Giles examines fragmentary sources for the political history of the late 18th Dynasty and particularly for the co-regency of Amenhotep and his son Akhenaten, and of Akhenaten and his son-in-law Smenkhkare. Giles puts forward a case in support of these two co-regencies by looking at royal burials and espeically Tomb 55 in the Valley of the Kings.