Timoleon

As for Mamercus, he gave himself up to Timoleon on condition that he should undergo trial at Syracuse, and that Timoleon should not denounce him.

So he was brought to Syracuse, and when he came before the people, attempted to rehearse a speech composed by him a long time before; but being received with noise and clamour, and seeing that the assembly was inexorable, he flung away his mantle, ran right across the theatre, and dashed head foremost against one of the stone steps, hoping to kill himself.