Son of King Laius and Queen Jocasta of Thebes who killed his father and married his mother (7)
I believe the answer is:
oedipus
(Other definitions for oedipus that I've seen before include "King known for complex" , "Tragic king of Thebes (with a complex)" , "He solved Sphinx's riddle" , "Mythic king who killed his father and married his mother" , "He married his mother (and had a Freudian complex!)" .)