谜语是一种利用文字、语言或符号来构建的智力游戏，通常需要一个或多个谜面来让人们猜出特定的答案。以下是一个基于民间故事的谜语：

谜面：

Long ago, in a kingdom far away, there lived a beautiful princess. She was locked in a high tower, awaiting rescue by a brave prince. One day, a mysterious figure appeared and helped her escape. Who was this mysterious figure?

答案：长发公主（Rapunzel）

这个谜语基于经典的民间故事《长发公主》。故事中，美丽的公主蕾郅（Rapunzel）被女巫关在高塔里，直到一位勇敢的王子出现并拯救了她。