The Armenian genocide was the systematic destruction of the Armenian people and identity in the Ottoman Empire during World War I. Spearheaded by the ruling Committee of Union and Progress (CUP), it was implemented primarily through the mass murder of around one million Armenians during death marches to the Syrian Desert and the forced Islamization of Armenian women and children.

Before World War I, Armenians occupied a protected, but subordinate, place in Ottoman society. Large-scale massacres of Armenians occurred in the 1890s and 1909. The Ottoman Empire suffered a series of military defeats and territorial lossesespecially the 19121913 Balkan Warsleading to fear among CUP leaders that the Armenians, whose homeland in the eastern provinces was viewed as the heartland of the Turkish nation, would seek independence. During their invasion of Russian and Persian territory in 1914, Ottoman paramilitaries massacred local Armenians. Ottoman leaders took isolated indications of Armenian resistance as evidence of a widespread rebellion, though no such rebellion existed. Mass deportation was intended to permanently forestall the possibility of Armenian autonomy or independence.

On 24 April 1915, the Ottoman authorities arrested and deported hundreds of Armenian intellectuals and leaders from Constantinople. At the orders of Talaat Pasha, an estimated 800,000 to 1.2 million Armenians were sent on death marches to the Syrian Desert in 1915 and 1916. Driven forward by paramilitary escorts, the deportees were deprived of food and water and subjected to robbery, rape, and massacres. In the Syrian Desert, the survivors were dispersed into concentration camps. In 1916, another wave of massacres was ordered, leaving about 200,000 deportees alive by the end of the year. Around 100,000 to 200,000 Armenian women and children were forcibly converted to Islam and integrated into Muslim households. Massacres and ethnic cleansing of Armenian survivors were carried out by the Turkish nationalist movement during the Turkish War of Independence after World War I.

The Armenian genocide resulted in the destruction of more than two millennia of Armenian civilization. Together with the mass murder and expulsion of Syriac and Greek Orthodox Christians, it enabled the creation of an ethnonational Turkish state. The Turkish government maintains that the deportation of Armenians was a legitimate action that cannot be described as genocide. As of 2022, 31 countries have recognized the events as genocide, as do the vast majority of historians.

Mehmed Talaat (1 September 1874 – 15 March 1921), commonly known as Talaat Pasha or Talat Pasha, was a Turkish Ottoman politician and convicted war criminal of the late Ottoman Empire who served as its de facto leader from 1913 to 1918. Talaat Pasha was chairman of the Union and Progress Party, which operated a one-party dictatorship in the Ottoman Empire during World War I. He undertook the Armenian genocide and other ethnic cleansing operations during his time as Minister of Interior Affairs.

Born in Kırcaali (Kardzhali), Adrianople (Edirne) Vilayet, Mehmed Talaat grew up to despise Sultan Abdul Hamid II's autocracy. He was an early member of the Committee of Union and Progress (CUP), a secret revolutionary Young Turk organization, and over time became its leader. After the CUP succeeded in restoring the constitution and parliament in the 1908 Young Turk Revolution, Talaat was elected as a deputy from Adrianople (Edirne) to the Chamber of Deputies and later became Minister of the Interior. Talaat played an important role in the downfall of Abdul Hamid the next year during the 31 March Incident by organizing a counter government. Multiple crises in the Empire including the 31 March Incident, attacks on Rumelian Muslims in the Balkan Wars, and the power struggle with the Freedom and Accord Party made Talaat and the Unionists disillusioned with multicultural Ottomanism and political pluralism, turning them into hard-line authoritarian Turkish nationalists.

After the 1913 coup and Mahmud Şevket Pasha's assassination, the Ottoman Empire was ruled by the Union and Progress in a one-party dictatorship, whose leaders were the triumvirate of Talaat, İsmail Enver, and Ahmed Cemal (known as the Three Pashas), of whom Talaat was its civilian leader and politically most powerful. Talaat and Enver were influential bringing the Ottoman Empire into the First World War. During World War I, Talaat ordered on 24 April 1915 the arrest and deportation of Armenian intellectuals in Constantinople (now Istanbul), most of them being ultimately murdered, and on 30 May 1915 requested the Temporary Law of Deportation; these events initiated the Armenian genocide. He is widely considered the main perpetrator of the genocide, and is thus held responsible for the death of around 1 million Armenians.

In a move that established total Unionist control over the Ottoman government, Talaat Pasha became Grand Vizier (Prime Minister) in 1917, and introduced many social reforms. Talaat personally negotiated the Treaty of Brest-Litovsk with the Bolsheviks, regaining parts of Eastern Anatolia which were occupied by Russia since 1878, and won the race to Baku on the Caucusus front. However breakthroughs by the Allies in the Macedonia and Palestine fronts meant defeat for the Ottomans and the downfall of the CUP. On the night of 2–3 November 1918, Talaat Pasha and other members of the CUP's central committee fled the Ottoman Empire. The Ottoman Special Military Tribunal convicted Talaat and sentenced him to death in absentia for subverting the constitution, profiteering from the war, and organizing massacres against Greeks and Armenians. Exiled in Berlin, he supported the Turkish Nationalists led by Mustafa Kemal Pasha (Atatürk) in Turkey's War of Independence. Talaat was assassinated in Berlin in 1921 by Soghomon Tehlirian, a member of the Armenian Revolutionary Federation, as part of Operation Nemesis.