Respuesta :
Answer:
1.The Ottoman Turks conquered Constantinople
2. Western countries launched a series of crusades
3.The fourth crusade attacked and sacked the city of Constantinople
ANSWER:
1}Western countries launched a series of crusades.
2}The Byzantine Emperor sought the crusaders' help to defeat the Arab Muslims.
3}The Fourth Crusade attacked and sacked the city of Constantinople.
4}The Ottoman Turks conquered Constantinople.