It would cover a list of objects dating from the late Stone Age through the end of the Byzantine Empire
in the 15th century.
The ROM icon's stylistic affinity with Moscow links it to an important period of the political and economic expansion of the Duchy of Moscow and its claim to the title of the Third Rome after the fall of Constantinople in 1453 and the end of the Byzantine Empire
He asserts that the Crusade:; advanced the end of the Byzantine Empire
and also that the Crusade ideology became a tool abused by Christian leaders to slay their own, as with the Albigensian Crusade.
That union of East and West however had failed to save Constantinople from the longfeared final onslaught of the Ottoman Turks, the city's siege and capture in 1453 -- which brought with it the end of the Byzantine Empire
-- was a psychological blow echoing those of the Black Death and Schism a century earlier.