For 10 points, identify this 1453 siege that spelled the end of the Byzantine Empire.
According to the historian Doukas, Notaras was incredibly eager to betray his ideals during this event until the opposing side demanded his son be used as a sex slave. In its aftermath, Gennadius Scholasticus was chosen to fill Athanasius II's post. Legend has it that one building during this event had its walls miraculously moved, so priests humming the liturgy could remain undiscovered. To prevent complications during this battle, the winning commander subdued the nearby Demetrius of Mesembria and Thomas of Morea. Sixty oxen were used to haul the cannon of Hungarian engineer Orban to this battle, in which one side hauled their fleet over land after chains were laid at the entrance of the Golden Horn. In its aftermath, Mehmed II repeatedly searched for the body of Constantine XI to prevent a new uprising. For 10 points, identify this 1453 siege that spelled the end of the Byzantine Empire.
According to the historian Doukas, Notaras was incredibly eager to betray his ideals during this event until the opposing side demanded his son be used as a sex slave.
Siege of Constantinople [or Battle of Constantinople]