sentences:  It was prepared by the Grand National Assembly that was elected both as a Constitutional Convention and as an acting Parliament on April 23, 1920, following the de facto collapse of the Ottoman Empire in the aftermath of the First World War.Mustafa Kemal Atatürk, who would later become the first president of the Republic of Turkey in 1923, was the major driving force behind the preparation of a Constitution that derived its sovereignty from the nation and not from the Sultan, the absolute monarch of the Ottoman Empire.The National Assembly convened with the purpose of writing a would prepare the ground for the proclamation of a Republic and consecrate the principle of national sovereignty.