The Battle of the River Thatis was part of a succession dispute in the Bosporan Kingdom that was fought in 310 BCE. On the death of King Pairisades, Satyrus took the throne, but his younger brother, Eumelos, fled to the Thataeans who backed his claim. Satyrus broke through the center, turned, and managed keep control of the victorious cavalry and charge the opposing left wing where Eumelos was being successful. Eumelus' army then fled to a nearby fortress.