Constantine Cominato Arianiti (Italian: Constantino Cominato Arianiti, Albanian: Kostandin Komneni Arianiti; 1456/1457 – 8 May 1530) also known as Constantine Komnenos Arianites, was a 15th and 16th-century Albanian nobleman, military leader, diplomat and pretender who lived most of his life in exile in Italy due to the conquest of his homeland by the Ottoman Empire. Constantine sought to establish himself as a leader among the Christian Balkan refugees in Italy and claimed lordship over various former Christian lands in Greece, using the titles Prince of Macedonia, Duke of Achaea and Despot of the Morea.