This film was intended to be the start of a reboot of Universal Studio's "Monsters Universe" that was popular back in the 1930s and 1940s with films like Dracula, Frankenstein, The Invisible Man, The Mummy, and The Wolf Man. It was later revealed Dracula Untold would not be part of the reboot series.
Real life Vlad Tepes was a prince of Wallachia (Tara Romaneasca). He reigned for two months as a puppet of the Turks in 1448, then for six years from 1456 to 1462, then one last time in 1476 when he was killed after two months.
Despite a fair amount of Turkish being spoken throughout the movie, none of the actors are Turkish or have Turkish language backgrounds. Therefore they have different accents even though their characters are native to the language, especially Dominic Cooper, whose accent is a dead give away, even when he is speaking English. His "r" sounds are more European than Turkish when Turkish people, even when speaking English, put a lot of stress on the "r"s, while Cooper almost always skips them.
In an early draft of the film, Charles Dance's Master Vampire was planned to be revealed as Roman Emperor Caligula. This was dropped with the intention of revealing it in a sequel if the film became part of the Universal "Dark Universe" shared universe.
The lines that Vlad quotes at the end ("Why think separately of this life and the next when one is born from the last?") are from the poem Look at Love by Mevlana Jelaluddin Rumi, a 13th century holy man and mystic.
This movie was in production before Universal decided to build a cinematic universe. The producers caught wind of it just in time to independently add a present-day epilogue that Universal could use if they wanted to, but it was ultimately decided that Dracula Untold (2014) would not be the first entry in the Universal Monsters Cinematic Universe.