He is also surnamed μακρόχειρ "Macrocheir (Latin = Longimanus)", allegedly because his right hand was longer than his left. After Persia had been defeated at Eurymedon, military action between Greece and Persia was at a standstill. When Artaxerxes I took power, he began a new tradition of weakening the Athenians by funding their enemies in Greece. This indirectly caused the Athenians to move the treasury of the Delian League from the island of Delos to the Athenian acropolis. This funding practice inevitably prompted renewed fighting in 450 BC, where the Greeks attacked at the Battle of Cyprus. After Cimon's failure to attain much in this expedition, the Peace of Callias was agreed between Athens, Argos and Persia in 449 BC.