Ottoman turks invasion of europe begains after the seljuk turks victory in Battle of MANZKERT
IN 1071 roman emperor take advantage of absence of Sultan ALPARSLAN (who is busy in eygpt with his whole army dealing with Fatimaids ) and invaded Seljuk Empire, Sultan offered peace to roman emperor but he refused at this AlpArslan quickly took his cavalary (20000 horse men) traveled withlightining speed and arrived at town of Manzikert, he than take the element of suprise and attack on 100,000 roman army and won, arrested the roman emperor than release him after some days and conqured region of Anatolia (mordern day Turkey)
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