"The Iron Mask" refers to a mysterious prisoner in France during the 17th century, often believed to be Louis XIV's twin brother or a political rival. He was kept in various prisons, including Bastille, and was forced to wear a mask to conceal his identity. The true identity of the man remains unknown, leading to numerous theories and legends. The story of the Iron Mask has inspired various works of literature and film, including Alexandre Dumas's novel "The Vicomte of Bragelonne." The enduring mystery surrounding this figure continues to captivate historians and the public alike, symbolizing secrecy and intrigue in royal history.