It is possible that the Athenians had attempted to negotiate with the Persians previously. Plutarch suggests that in the aftermath of the victory at the Eurymedon, Artaxerxes had agreed to a peace treaty with the Greeks, even naming Callias as the Athenian ambassador involved. However, as Plutarch admits, Callisthenes denied that such a peace was made at this point (c. 466 BC). Herodotus also mentions, in passing, an Athenian embassy headed by Callias, which was sent to Susa to negotiate with Artaxerxes. This embassy included some Argive representatives and can probably be therefore dated to c. 461 BC (after an alliance was agreed between Athens and Argos). This embassy may have been an attempt to reach some kind of peace agreement, and it has even been suggested that the failure of these hypothetical negotiations led to the Athenian decision to support the Egyptian revolt. The ancient sources therefore disagree as to whether there was an official peace or not, and, if there was, when it was agreed.