Which of these words was derived from the title of a fairy tale about three princes?

The name Serendipity is of American origin and derives its roots from the word Serendip, which means a fortuitous discovery or a happy accident. The term was first coined by author Horace Walpole in 1754, in reference to the Persian fairy tale "The Three Princes of Serendip". In this tale, the protagonists possess the gift of making unexpected discoveries or finding valuable things without intentionally seeking them. Walpole used the term to describe a similar experience in his letter, thus introducing the concept of serendipity into the English language.

"The Three Princes of Serendip" is the English version of the story "Peregrinaggio di tre giovani figliuoli del re di Serendippo", published by Michele Tramezzino in Venice in 1557. Tramezzino claimed to have heard the story from one Cristoforo Armeno, who had translated the Persian fairy tale into Italian, adapting Book One of Amir Khusrau's "Hasht-Bihisht" of 1302. The story first came to English via a French translation, and now exists in several out-of-print translations. Serendip is the Classical Persian name for Sri Lanka (Ceylon).