Original: At age fourteen , Ramesses was appointed Prince Regent by his father Seti I/O. He is believed to have taken the throne in his late teens and is known to have ruled Egypt from 1279 BC to 1213 BC for a total of 66 years and 2 months , according to both Manetho and Egypt 's contemporary historical records .
Simplified: When he was 14 , Ramesses was appointed successor by his father Seti I/O. He ruled Egypt from 1279 BC to 1213 BC . p165 This is a total of 66 years and 2 months .