 Complete the following phrase:  In 1457, Skanderbeg had achieved his most famous victory over the Ottoman Empire at Albulena Ujëbardha, which was received with great enthusiasm throughout Italy. In order to repay Alfonso for the ficial and military assistance given to him years before, Skanderbeg took up the popes pleas to help out Alfonsos son by sending a military expedition to Italy. Before leaving, Skanderbeg tried to negotiate a ceasefire with Sultan Mehmed II, the 