In both the south and the north of Ottoman Kurdistan, new powers were in development. In the north, the Kemalists were taking control. In the south, the British Empire was in control. The son of Said Berzinci, Sheikh Mahmud Barzanji was the leader of the Kurdish nationalists in Sulaymaniyah. The British Empire overcame the rebellion of Mahmud Barzanji, and the south of Kurdistan became part (Iraqi Kurdistan) of the new Kingdom of Iraq. In 1921, the Kemalists overcame a Kurdish rebellion (the Koçgiri rebellion) in the area of Koçgiri (near Sivas). By 1923, the Kemalist government was in control of all Anatolia. After the Kemalist armies overcame the Kingdom of Greece in the Greco-Turkish War (1919–1922), the Allies ended their Occupation of Constantinople in 1923. Then the Kemalists took control of the capital city. The new government in Constantinople ended the existence of many Kurdish organizations. Many Kurds went into exile.