who defeated constantine? plz help ASAP

To find out who defeated Constantine, also known as Constantine XI, you can follow these steps:

1. Identify the historical context: Constantine XI was the last Byzantine emperor and ruled over the Byzantine Empire from 1449 to 1453.

2. Understand the events leading to Constantine's defeat: During Constantine's reign, the Byzantine Empire faced constant threats from the expanding Ottoman Empire, led by Mehmed II.

3. Research the Siege of Constantinople: In 1453, Mehmed II launched a massive invasion with the main objective of capturing Constantinople, the capital of the Byzantine Empire. This marked the end of the Byzantine Empire.

4. Learn the outcome: Mehmed II's forces successfully breached the city's defenses, leading to the fall of Constantinople on May 29, 1453. Constantine XI fought bravely but perished during the siege, and his body was never found.

In conclusion, Mehmed II, the Ottoman Sultan, defeated Constantine XI and captured Constantinople, leading to the downfall of the Byzantine Empire.