Thamos has succeeded his father , Ramesses , as king of Egypt .
Father had usurped the throne from the rightful king , Menes , who is now disguised as the high priest , Sethos .
Thamos has succeeded his father , Ramesses , as king of Egypt , but Ramesses had usurped the throne from the rightful king , Menes , who is now disguised as the high priest , Sethos .