April 24, 1915: Killing of Armenians by the Turks begins. By 1923, about 1.5 million Armenian Christians had been killed by the Turks in what is now known as the Armenian Genocide.
30 April 711: Islamic Moorish troops led by Tariq ibn-Ziyad land at Gibraltar to begin their invasion of the Iberian Peninsula. Spain would be occupied by the Moors for the next 700+ years until they were finally driven out in 1492.