With his own sword,
Which he did wave against my throat, I have ta’en
His head from him; I’ll throw ’t into the creek
Behind our rock, and let it to the sea
Cloten has lost his head several times thus far but now he loses it in the most literal sense of the word, at the hands of one of his step brothers - though he doesn't realize that's who it is. When Imogen comes upon his body she takes it for that of Posthumus and is understandably quite distraught. She throws herself on the body - pretty grim stuff, I say - and is still lying there, still in disguise, when Caius Lucius and a few of the other Romans happen to wander on by.