The title question probably seems obvious, and doubtlessly some of you answered it in your head with things like, "a Tolkien book published posthumously in 1977" or "the early history of Tolkien's legendarium." Because we are a "Silmarillion" archive (and yes, the use of quotes and not italics is intentional!¹), this question also becomes a matter of policy for us. In the early years of our archive, we called it our MFAQ—most frequently asked question—because we were asked it more often than any other: "Is this story 'Silmarillion' enough for your site?" or "What counts as the 'Silmarillion' anyway?"

This has reduced somewhat as the fandom has come to better understand what The Silmarillion actually is (a compiled, edited, posthumous book) versus the decades of work (and reams of drafts and notes) Tolkien put into a text he never managed to see to fruition. Most fans are very comfortable letting all that fall under "Silmarillion" material. Tolkien fandom has become more comfortable with fuzziness, whether in defining what counts as "canon" or in the boundaries that exist between the texts in the legendarium.

Once upon a time, there was a common misconception that "Silmarillion" meant First Age and earlier. Our annual Akallabêth in August challenge and the 2009 Akallabêth in August compilation was intended to push back against this misunderstanding and spotlight the creators making incredible Second Age fanworks, who often felt marginalized in their own fandom. But of course the "Silmarillion" includes a substantial amount of the Third Age as well. Our MFAQ defines this as "any Third Age that is not covered in detail in The Hobbit or Lord of the Rings," which leaves a lot of ground to be covered. Furthermore, fanworks that include materials from The Hobbit and The Lord of the Rings certainly aren't verboten—they just need "a significant basis in or connection to The Silmarillion."

Our MFAQ includes a checklist that helps you determine what that means. (Spoiler alert: It is not a hard bar to clear for us.) If you have Third Age or other "borderline" fanworks that you've thought about posting with us, check it out! Chances are that we'd welcome your work. You can read the full FAQ on how we define "Silmarillion fanworks" here.

As with just about everything we do, we aim to include rather than exclude, to expand rather than limit. While we are a "Silmarillion" site, our purpose has never been to draw hard lines between "Silmarillion" and "everything else," and for us, a "maybe" is almost guaranteed to be a "go for it." If you ever have questions about whether a work is appropriate for our site, start with our MFAQ and then reach out to the mods if you need further guidance.

1. First newsletter with footnotes! In Tolkien scholarship, the convention has become to refer to the published text as The Silmarillion and the body of work comprising the early legendarium as the "Silmarillion." Since we aim for inclusivity and expansiveness whenever we can, we opt for the "Silmarillion," as that sweeps in a whole range of posthumous works, appendix materials, etc. (although usage across the site is likely inconsistent on this point. The inclusivity stands.)