Hans Christian Andersen in the context of "The Little Mermaid (1989 film)"

"Once upon a time" is a stock phrase used to introduce a narrative of past events, typically in fairy tales and folk tales. It has been used in some form since at least 1380 in storytelling in the English language and has started many narratives since 1600. These stories sometimes end with "and they all lived happily ever after", or, originally, "happily until their deaths".

The phrase is common in fairy tales for younger children. It was used in the original translations of the stories of Charles Perrault as a translation for the French "il était une fois", of Hans Christian Andersen as a translation for the Danish "der var engang" (literally "there was once"), the Brothers Grimm as a translation for the German "es war einmal" (literally "it was once") and Joseph Jacobs in English translations and fairy tales.

Nikolaj Frederik Severin Grundtvig (Danish: [ˈne̝kolɑjˀ ˈfʁeðˀʁek ˈse̝vəʁiˀn ˈkʁɔntvi, - ˈfʁæðˀʁæk -]; 8 September 1783 – 2 September 1872), most often referred to as N. F. S. Grundtvig, was a Danish pastor, author, poet, philosopher, historian, teacher and politician. He was one of the most influential people in Danish history, as his philosophy gave rise to a new form of nationalism in the last half of the 19th century. It was steeped in the national literature and supported by deep spirituality.

Grundtvig holds a unique position in the cultural history of his country. Grundtvig and his followers are credited with being very influential in the formulation of modern Danish national consciousness. He was active during the Danish Golden Age, but his style of writing and fields of reference are not immediately accessible to a foreigner, thus his international importance does not match that of his contemporaries Hans Christian Andersen and Søren Kierkegaard.

A distorting mirror, funhouse mirror or carnival mirror is a popular attraction at carnivals and fairs. Instead of a normal plane mirror that reflects a perfect mirror image, distorting mirrors are curved mirrors, often using convex and concave sections to achieve the distorted effect. Because of their distorting properties, they are sometimes featured in fiction as a literary device, such as in Hans Christian Andersen's 1844 fairy tale The Snow Queen.

Distorted mirrors are used as a metaphor for describing Wikipedia, personalized medicine and social media which rather than reflecting society, tend to distort our perceptions of reality and social norms.

Odense (/ˈoʊdənsə/ OH-dən-sə, US also /ˈoʊθənsə/ OH-thən-sə; Danish: [ˈoðˀn̩sə] ) is the third largest city in Denmark (after Copenhagen and Aarhus) and the largest city on the island of Funen. As of 1 January 2025, the city proper had a population of 185,480 while Odense Municipality had a population of 210,803, making it the fourth largest municipality in Denmark (behind Copenhagen, Aarhus and Aalborg municipalities). Eurostat and OECD have used a definition for the Metropolitan area of Odense (referred to as a Functional urban area), which includes all municipalities in the Province (Danish: landsdel) of Funen (Danish: Fyn), with a total population of 504,066 as of 1 July 2022.

By road, Odense is located 45 kilometres (28 mi) north of Svendborg, 144 kilometres (89 mi) to the south of Aarhus and 167 kilometres (104 mi) to the southwest of the capital Copenhagen. The city was the seat of Odense County until 1970, and Funen County from 1970 until 1 January 2007, when Funen County became part of the Region of Southern Denmark. Odense has close associations with Hans Christian Andersen who is remembered above all for his fairy tales. He was born in the city in 1805 and spent his childhood years there.

Thumbelina (/ˌθʌmbəˈliːnə/; Danish: Tommelise) is a literary fairy tale written by Danish author Hans Christian Andersen. It was first published by C. A. Reitzel on 16 December 1835 in Copenhagen, Denmark, with "The Naughty Boy" and "The Travelling Companion" in the second installment of Fairy Tales Told for Children. Thumbelina is about a tiny girl and her adventures with marriage-minded toads, moles, and cockchafers. She successfully avoids their intentions before falling in love with a flower-fairy prince just her size.

"The Emperor's New Clothes" (Danish: Kejserens nye klæder [ˈkʰɑjsɐns ˈnyˀə ˈkʰlɛːðə]) is a literary folktale written by the Danish author Hans Christian Andersen, about a vain emperor who gets exposed before his subjects. The tale has been translated into over 100 languages.

"The Emperor's New Clothes" was first published with "The Little Mermaid" in Copenhagen, Denmark, by C. A. Reitzel, on 7 April 1837, as the third and final installment of Andersen's Fairy Tales Told for Children. The tale has been adapted to various media, and the story's title, the phrase "the Emperor has no clothes", and variations thereof have been adopted for use in numerous other works and as idioms.

"The Little Mermaid" (Danish: Den lille havfrue), sometimes translated in English as "The Little Sea Maid", is a fairy tale written by Danish author Hans Christian Andersen. Originally published in 1837 as part of a collection of fairy tales for children, the story follows the journey of a young mermaid princess who is willing to give up her life in the sea as a mermaid to gain a human soul.

The original story has been the subject of multiple analyses by scholars such as Jacob Bøggild and Pernille Heegaard, as well as the folklorist Maria Tatar. These analyses cover various aspects of the story, from interpreting the themes to discussing why Andersen chose to write a tragic story with a happy ending. It has been adapted to various media, including musical theatre, anime, ballet, opera, and film. There is also a statue portraying the mermaid in Copenhagen, Denmark, where the story was written and first published.

"The Nightingale" (Danish: Nattergalen) is a literary fairy tale written by Danish author Hans Christian Andersen. Set in imperial China, the story recounts the friendship between the Emperor of China and a nightingale.