It can also be used for the art of people of the former Byzantine Empire under the rule of Ottoman Empire after 1453. In some respects, the Byzantine artistic tradition has continued in Russia and other Eastern Orthodox countries to the present day. Byzantine art grew from the art of ancient Greece and, at least before 1453, never lost sight of its classical heritage, but was distinguished from it in a number of ways. The most profound of these was that the humanist ethic of ancient Greek art was replaced by the Christian ethic. If the purpose of classical art was the glorification of man, the purpose of Byzantine art was the glorification of God. In place of the nude, the figures of God the Father, Jesus Christ, the Virgin Mary and the saints and martyrs of Christian tradition were elevated and became the dominant - indeed almost exclusive - focus of Byzantine art. One of the most important forms of Byzantine art was, and still is, the Cretan school as the leading school of Greek post-Byzantine painting after Crete fell to the Ottomans in 1669. Like the Cretan school, it combined Byzantine traditions with an increasing Western European artistic influence, and also saw the first signiand the National Gallery of Art in Washington, D.C.  "Cretan School" describes the school of icon painting, also known as "Post-Byzantine art", which flourished while Crete was under Venetian rule during the late Middle Ages, reaching its climax after the Fall of Constantinople, becoming the central force in Greek painting during the 15th, 16th and 17th centuries. The Cretan artists developed a particular style of painting under the influence of both Eastern and Western artistic traditions and movements; the most famous product of the school, El Greco, was the most successful of the many artists who tried to build a career in Western Europe, and also the one who left the Byzantine style farthest behind him in his later career. The "Heptanese School" of painting (, also known as the "Ionian Islands' School") succeeded the Cretan School as the leading school of Greek post-Byzantine painting after Crete fell to the Ottomans in 1669. Like the Cretan school it combined Byzantine traditions with an increasing Western European artistic influence, and also saw the first significant depiction of secular subjects. The school was based in the Ionian Islands, which were not part of Ottoman Greece, from the middle of the 17th century until the middle of the 19th century.