The Armenian Genocide

Beginning on or about April 24, 1915, the Ottoman Empire began the systematic extermination of approximately 1,500,000 humans, most of whom were so-called "citizens" of the Ottoman Empire.

Though, it's known as the Armenian Genocide or Armenian Holocaust, this atrocity falls under the newer and more descriptive term "democide", which is used to denote genocides committed by government against "their own" people.

Turkish official teases starving children by taunting them with bread.
(Click to Enlarge)

Christian Armenian women crucified in 1915 

Learn more:
Wikipedia
History.com
Armenian Genocide Museum