Commentary on the First Alcibiades of Plato (Cambridge, University Library, MS Kk.5.27)

slandered journey was undertaken. And having been slandered to Dionysius by his body?guards, as if he intended to secure the power for Dion and overthrow Dionysius, he was seized by him and handed over to Pollis the Aeginetan, who was trading in Sicily, to be sold. Pollis, having taken him to Aegina, found Anicerris the Libyan there, who was intending to sail to Elis to compete with a four-horse chariot. Having encountered Pollis, he bought Plato from him. He achieved a glory greater than any victory in a chariot race. Regarding this, Aristeides says that no one would have known of Anicerris had he not bought Plato. The cause of the third journey to Sicily again was this: Dion having been confiscated by Dionysius, and stripped of his possessions, was cast into prison.
was cast

He therefore wrote to Plato that Dionysius had promised to release him if Plato would come to him again. And Plato, wishing to assist his companion, readily undertook the third journey. These are the things regarding the philosopher's travel to Sicily. It should also be known that he went to Egypt to the priestly men there, and learned