Deportation of Armenian intellectuals on 24 April 1915
The deportation of Armenian intellectuals is conventionally held to mark the beginning of the Armenian genocide. Leaders of the Armenian community in the Ottoman capital of Constantinople (now Istanbul), and later other locations, were arrested and moved to two holding centers near Angora (now Ankara).
Source: Wikipedia — Deportation of Armenian intellectuals on 24 April 1915 (CC BY-SA 4.0)