Here's a bit of a semi sarcastic plot I came up with. Historical accuracy be damned, this is Hollywood!
INTRODUCTION
George Sphrantzes sits in a small monastery in Venetian Corfu in 1460. He begins telling his infant grandchildren the story of the Great Siege.
SCENE ONE
Sultan Murad II dies, and his son Mehmet becomes Sultan. Immediately afterward, Mehmet is put under pressure by the corrupt old paedophile Halil Pasha, who despises valiant young Mehmet, and secretly wants to sieze the throne for himself, since he is the secret love child of Timur the Lame and a Turkish princess. Mehmet silences his critics at Edirne by invading the Morea.
Meanwhile, in Mistra, Constantine XI becomes Emperor just as the Turkish armies penetrate into the Morea. He is forced to flee, in the process selling his unfortunate daughter into slavery in exchange for passage on a Catalan ship. The Ottomans make it to the beach (yeah, in this film Mistra is somehow a coastal city) and shake their fists theatrically at Constantine, before treating the inhabitants of Mistra with exemplary politeness.
SCENE TWO
Constantine arrives at his capital, and is horrified to find the Land Walls being taken down by his treacherous chief minister, Loukas Notaras. Constantine immediately orders Notaras to stop, but Notaras is a secret ally of the Venetians, who aim to sieze Constantinople for themselves, and ignores the Emperor. Just as Constantine's powerlessness is about to be proved, the heroic Giovanni Giustiniani arrives, and strikes down Notaras. Giustiniani then suggests to the Emperor that he should ask for the support of the Pope in dealing with the Turks.
Mehmet finds himself a lover, the daughter of a Hungarian merchant by the name of Orban. Orban and his daughter then convince the Sultan to attack Constantinople so they can settle a score with the dashing Byzantine, George Sphrantzes, who once rejected Orban's sister as a lover. When Mehmet enquires as to how this can be done, Orban shows the Sultan sketches of his cannons. Mehmet is duly impressed, and Orban leaves, eager for his revenge.
Someone else take this mangled plot from here