"Sigelwara Land" is an essay by J. R. R. Tolkien that appeared in two parts, in 1932 and 1934.[1] It explores the etymology of the Old English word for the ancient Aethiopians, Sigelhearwan, and attempts to recover what it might originally have meant. Tolkien suggested that its two elements were most likely sun/jewel and coal/hearth, perhaps meaning something like a soot-black fire-demon.
The Tolkien scholar and philologist Tom Shippey suggests that Tolkien's detailed study of the word may have influenced him in his creation of elements of his fantasy world of Middle-earth, including the Silmarils or forged sun-jewels, the Balrogs or dark fire-demons, and the Haradrim, men of the hot south.
Shippey 2005
was invoked but never defined (see the help page).