Jason’s hamartia is his rationality. He leaves Medea not for some whim of emotion, but to give himself and his children a position of power within the kingdom of Corinth.
“Not – what makes thy passion wild – / From loathing of thy bed; not overfraught / With love for this new bride; not that I sought / To upbuild mine house with offspring: … / But, first and greatest, that we all might dwell in a fair house and want not, … Next, I sought to rear / Our sons in nurture worthy of my race, / And, raising bretheren to them, in one place / Join both my houses, and be all from now / Prince-like and happy.” (31)
Jason’s rationality causes his downfall because of his inability to realize that Medea would act irrationally. Medea, once she finds out about Jason’s betrayal cries curses about Jason; King Creon; and Jason’s fiancé, Glauce. It is this emotional cry that causes Medea and her children to be outcast from Corinth, ruining Jason’s plan. Jason’s fortunes at the start of the play are very
Cited: Euripides. Medea (G. Murray, Trans.). New York: Oxford University Press, 1912. archive.org. 1 June, 2008 .