One of the main reasons why the Islamic world suffered hardship during the 1200s and 1300s was because "<span>d. Western European kings sent armies to retake Jerusalem and capture as many Muslims as possible to use as slaves," since this was the time of the "Crusades". </span>
He divide the empire<span> into two halves and shared his power with a co-</span>emperor<span>.
I hope this answers your question :)</span>