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In 20 July 1402 the Ottomans suffered a crushing defeat by Tamerlane's Mongols in the battle of Ankara and Sultan Beyazid I was captured and died shortly after... The Ottoman Empire was weakened significantly and a civil war erupted among Beyazid's sons...
Is it possible that Eastern Roman Emperor Manuel II had taken the chance and strike back at a weakened Ottoman Empire (with the help of Western powers of course)? A crusade had already failed in 1396 but Manuel who was on a tour to European courts could lure the Kings to help him? Or it is ASB?