Final answer:
Vlad III Dracula's final reign occurred in 1476, a defining moment in the Late Middle Ages.
Step-by-step explanation:
Vlad III Dracula's third and final reign took place in the year 1476. This period in European history falls within what historians often refer to as the Late Middle Ages, which is known for chaos and transformation leading to the rise of new states. Vlad III, also known as Vlad the Impaler, is a historical figure associated with the inspiration for the character Dracula in Bram Stoker's novel, and his reign took place before the fall of the Byzantine Empire, an event marking the end of the Middle Ages and the beginning of the Ottoman ascendancy in Eastern Europe.