These speeches were delivered on the occasion of Aeschines' prosecution of Ctesiphon, which was in fact a pretext to attack Demosthenes and the politics he had supported during the war against Macedonia. With his defence speech Demosthenes won the trial.
Bouchard, Elsa. "Aeschines' Against Ctesiphon and Demosthenes' On the Crown". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11288, accessed 11 March 2014.]