What group partitioned the Middle East that was formerly under Ottoman control?

The group that partitioned the Middle East, which was formerly under Ottoman control, was primarily the Allied Powers following World War I. In particular, the Sykes-Picot Agreement of 1916, a secret agreement between Britain and France, laid out plans for dividing the Ottoman territories in the Middle East into different spheres of influence. Subsequently, the Treaty of Sèvres in 1920 and the Treaty of Lausanne in 1923 further defined the borders and mandates in the region. These actions led to the establishment of modern nation-states in the Middle East.