The Turkic term oguz or ogur (in z- and r-Turkic, respectively) is a historical term for "military division, clan, or tribe" among the Turkic peoples. The oguz were divisions of the early Turkic Nomadic empires of the 5th to 11th centuries, including Khazars,Bulgars and Uyghurs. With the Mongol invasions of 1206–21, the Turkic khaganates were replaced by Mongol or hybrid Turco-Mongol confederations, where the corresponding military division came to be known as orda.