Khuseyn Vakhaevich Gakayev (Russian: Хусейн Вахаевич Гакаев), also known as Emir Mansur (not to be confused with Amir Mansur, or Arbi Yovmurzaev, the Chechen nationalist commander killed in 2010) and Emir Hussein, was a mujahid Emir (commander) fighting in Chechnya.