In terms of foreign policy, Cosimo worked to create peace in northern Italy through the creation of a balance of power between Florence, Naples, Venice and Milan during the wars in Lombardy between 1423 and 1454 and the discouragement of outside powers (notably the French and the Holy Roman Empire) from interfering in Italian affairs. In 1439, he was instrumental in convincing Pope Eugene IV to move the Ecumenical Council of Ferrara to Florence. The arrival of many notable Byzantine figures from the Eastern Roman Empire, including Emperor John VIII Palaiologos, for this event further inspired the growing interest in ancient Greek arts and literature.