Prince Charles and Princess Diana's marriage was not a real-life fairytale. The couple shocked the world when they separated in 1992 and then ultimately divorced in 1996, but the writing was really on the wall from the beginning of their union.Royal biographer Ingrid Seward, author of Prince Philip Revealed: A Man of His Century, explained to Us Weekly that Charles "felt he’d been very pushed into marrying" Diana—by none other than his own father, Prince Philip.