After this event Aegisthus reigned seven years longer over Mycenae, until in the eighth Orestes, the son of Agamemnon, returned home and avenged the death of his father by killing Aegisthus.
Aegisthus reigned seven years longer over Mycenae. This was until in the eighth Orestes returned home and avenged the death of his father by killing Aegisthus. This was after this event. The eighth Orestes were the son of Agamemnon.