After the Battle of Salamis-in-Cyprus, Thucydides makes no further mention of conflict with the Persians, saying that the Greeks simply returned home. Diodorus, on the other hand, claims that in the aftermath of Salamis, a full-blown peace treaty (the "Peace of Callias") was agreed with the Persians. Diodorus was probably following the history of Ephorus at this point, who in turn was presumably influenced by his teacher Isocrates—from whom there is the earliest reference to the supposed peace, in 380 BC. Even during the 4th century BC, the idea of the treaty was controversial, and two authors from that period, Callisthenes and Theopompus, appear to reject its existence.