The Ottoman Empire
While the Ottoman Empire ruled for hundreds of years, in its decline from 1914 to 1922, it sanctioned genocide against Christian Greeks. Under the rule of the Young Turks and Mustafa Kemel, 3.5 million Greeks, Armenians, and Assyrians were killed. The empire was dissolved in 1922.
I'm not sure where or how, izismile gets his facts... well, not facts really, leftist propaganda more like it. As in, Confederates raping "millions" of African-American women and, too, the items you mention as well as many others. Columbus a 'conquistador'... seriously.
Post entertainment, entertaining pictures, etc., not skewed takes on history in support of a Howard Zinn view of the world.