Which of the following major events happened in the year 1453?

a. islam was made the official religion of india

b. the ottoman turks conquered constantinople

c. the roman empire collapsed

d. the mayan civilization disapeared

In the year 1453 the major incident that happened was the Ottoman Turks conquered Constantinople. The correct option among all the options given in the question is option "b". The Byzantine Empire ended with the fall of Constantinople. The capital of the Byzantine Empire was captured by the Ottoman conqueror Sultan Mehmed II. Curtains came down on the great Byzantine empire and the rule of the Ottoman Turks started in Constantinople. This was a major historical event that occurred during the year 1453.