554 years ago today, Constantinople, the God-guarded City, the Queen of Cities, fell to the assault of the forces of the Ottoman Sultan Mehmed II.  Three days of pillage and rapine followed.  The Byzantine Empire came to an end after 1,123 years.

Update: Paul Cella has a good commemoration here.  

Second Update: Dr. Trifkovic also has a very good piece on the Fall of Constantinople.