Crito
The dialogue takes place in Socrates' prison cell, where he awaits execution. He is visited before dawn by his old friend Crito, who has made arrangements to smuggle Socrates out of prison to the safety of exile. Socrates seems quite willing to await his imminent execution, and so Crito presents as many arguments as he can in order to persuade Socrates to escape. On a practical level, Socrates' death will reflect badly on his friends--people will think they did nothing to try to save him. Also, Socrates should not worry about the risk or the financial cost to his friends; these they are willing to pay, and they have also arranged to find Socrates a pleasant life in exile. On a more ethical level, Crito presents two more pressing arguments: first, if he stayed, he would be aiding his enemies in wronging him unjustly, and would thus be acting unjustly himself; and second, that he would be abandoning his sons and leaving them without a father.
Polycrates
Herodotus also tells the story of Polycrates' death. Near the end of the reign of Cambyses, the governor of Sardis, Oroetus, planned to kill Polycrates, either because he had been unable to add Samos to Persia's territory, or because Polycrates had supposedly snubbed a Persian ambassador. In any case, Polycrates was invited to Magnesia, where Oroetus lived, and despite the prophetic warnings of his daughter, who had apparently dreamt of him hanging in the air, being washed by Zeus and anointed by the Sun God Helios, he went and was assassinated. The manner is not recorded by Herodotus, as it was apparently an undignified end for a glorious tyrant, but he may have been impaled and his dead body was crucified. The prophecy was fulfilled as when it rained he was 'washed by Zeus' and when the sun shone he was 'anointed by Helios', as the moisture was sweated from him.