We are going back to 1204 and IV. Crusaders campaign. This time period was very important because a Latin kingdom was founded in Constantinople (1204- 1264).
Crusaders planned to conquer Jerusalem so they had a break in Constantinople. Crusaders impressed from the wealthy of Constantinople. East Roman Empire was in conflict in that period. So Crusaders didn’t go to Jerusalem. They invaded Constantinople and they founded a Latin Kingdom in Constantinople. Greek who ran away from Constantinople established small states in Small Asia.
Crusaders had settled in Constantinople for 60 years and they ruined the city. They melted metal monuments and pressed coins. A Latin commander was buried to St.Sophia. Bithynia Kingdom got Constantinople back in 1264. Byzantine Empire was reestablished again. But Constantinople never got golden days back till it became Istanbul.
It was an important time period for the history.