The historical figure most famously referred to as the "Mad King" in a German context is King Ludwig II of Bavaria (reigned 1864–1886). While he was technically a king of Bavaria rather than all of Germany, his legacy is deeply intertwined with German history. Ludwig earned this nickname due to his eccentric behavior, his obsession with building opulent fairy-tale castles—most notably Neuschwanstein, which later inspired Disney’s Sleeping Beauty Castle—and his preference for isolation over political duty. He spent vast sums of the royal treasury on these architectural fantasies, leading his own government to declare him mentally unfit to rule in 1886. Just days after being deposed and interned, Ludwig’s life ended in mystery when his body and that of his psychiatrist were found in Lake Starnberg. While the "madness" was likely a political label used to remove him from power, modern historians often view him as a visionary who was simply unsuited for the rigid political environment of the 19th century. Today, his castles are among Germany’s most popular and profitable tourist attractions, ironically making him one of the country's most successful "investors" in the long run.