In 1071 the Seljuk Turks, who practiced this religion, defeated the Byzantine Army at the Battle of Manzikert
The decisive defeat of the Byzantine army and the capture of the 
Emperor ... "In 1071, the Seljuqs crushed an imperial army at the Battle of 
Manzikert (in ... was then defeated and captured by the Seljuks under the Sultan 
Alp Arslan.