Charles, Prince of Wales. Unlike his mother, Queen Elizabeth II, Charles always knew he would one day become King. Becoming heir apparent at just three years old, Charles has become the oldest and longest serving heir apparent in British history, as well as the longest serving Prince of Wales, having held the title since 1958. In his own way, he has defined the role of heir apparent. He has been called a visionary in his creative and forward thinking ideas, with his passions for the environment,...show more