Elendil
... that J. R. R. Tolkien invented Elendil for a time-travel story, but ultimately included the character in his main Middle-earth mythology?
... that <a href="./J._R._R._Tolkien" id="mwBfM" rel="mw:WikiLink" title="J. R. R. Tolkien">J. R. R. Tolkien</a> invented <b id="mwBfQ"><a href="./Elendil" id="mwBfU" rel="mw:WikiLink" title="Elendil">Elendil</a></b> for a <a href="./Time_travel_in_fiction" id="mwBfY" rel="mw:WikiLink" title="Time travel in fiction">time-travel story</a>, but ultimately included the character in his main <a href="./Middle-earth" id="mwBfc" rel="mw:WikiLink" title="Middle-earth">Middle-earth</a> mythology?