IL274129 The Capture of Constantinople by Crusaders (colour litho) by Valda, John Harris (d.1941); Private Collection; (add.info.: The Fourth Crusade (1202-1204) was originally designed to conquer Muslim Jerusalem through an invasion of Egypt, instead, in April 1204, the Crusaders of the West invaded and conquered the Christian (Eastern Orthodox) city of Constantinople, capital of the Byzantine Empire;); English, out of copyright.