How long did the Byzantine Empire last?

http://www.history.com/topics/ancient-history/byzantine-empire

The Byzantine Empire lasted for approximately 1,123 years, from 330 AD to 1453 AD. To find this answer, you can either consult a historical source or perform a basic calculation using the known start and end dates of the empire.

To consult a historical source:

1. Use a search engine to look for reputable historical websites or books that provide information about the Byzantine Empire.
2. Look for sources that specifically mention the duration of the empire.
3. Cross-reference multiple sources to verify the information and ensure accuracy.

To calculate the duration using the start and end dates:

1. Determine the known start date of the Byzantine Empire, which is commonly considered as 330 AD when Emperor Constantine I founded the city of Constantinople.
2. Determine the known end date of the empire, which is commonly considered as 1453 AD when Constantinople fell to the Ottoman Empire.
3. Subtract the start date from the end date: 1453 - 330 = 1123.
4. The result, 1,123 years, represents the approximate duration of the Byzantine Empire.

Remember that historical events and dates can sometimes vary depending on different interpretations and sources. It's always a good practice to consult reputable sources and cross-reference information for accurate results.