This work ('The High Priests of Amun in the 'wHm mswt' Era and the Twenty-First Dynasty') explores the chronological, genealogical and historical controversies from a very dark episode in ancient Egypt: the period at the end of the rule of Ramesses XI and the beginning of the Third Intermediate Period (XXI Dynasty). The research focuses on the role played by the Theban High Priests of Amun - a field of study so far neglected by other Egyptologists.