In the English speaking world, it’s source is traced to Horace Walpole. He coined the term in his recollection of part of a fairy tale where three princes try to discern the nature of a lost camel. The fairy tale is titled The Three Princes of Serendip from 1754. (Can honestly say I don’t recall that fairy tale from my childhood.)
I like this definition better—finding agreeable things not sought for.
A bit of Serendipity Stitches of pve designs. No camels involved!
You can see Serendipity Part One here.