Repeatedly defeated in battle by the Greeks, and plagued by internal rebellions that hindered their ability to fight the Greeks, after 449 BC, Artaxerxes I and his successors instead adopted a policy of divide-and-rule. Avoiding fighting the Greeks themselves, the Persians instead attempted to set Athens against Sparta, regularly bribing politicians to achieve their aims. In this way, they ensured that the Greeks remained distracted by internal conflicts, and were unable to turn their attentions to Persia. There was no open conflict between the Greeks and Persia until 396 BC, when the Spartan king Agesilaus briefly invaded Asia Minor; as Plutarch points out, the Greeks were far too busy overseeing the destruction of their own power to fight against the "barbarians".