1754 (but rare before 20c.), coined by Horace
Walpole (1717-92) in a letter to Mann (dated Jan. 28); he said he formed
it from the Persian fairy tale "The Three Princes of Serendip," whose
heroes "were always making discoveries, by accidents and sagacity, of
things they were not in quest of." The name is from Serendip, an old name for Ceylon (modern Sri Lanka), from Arabic Sarandib, from Skt. Simhaladvipa "Dwelling-Place-of-Lions Island."