This classic fairy tale from Denmark tells the story of a young princess who must prove her royal identity by passing a test involving a single pea. After being invited to stay in a prince's castle, the princess is asked to sleep on a bed of mattresses with a single pea underneath
From Wikipedia
"The Princess and the Pea" is a literary fairy tale by Hans Christian Andersen about a princess who is tested to become the wife to a lonely prince. The tale was first published with three others by Andersen in a cheap booklet on 8 May 1835 in Copenhagen by C. A. Reitzel.