'Luthany' is a fictional country that was invented in The Mistress of Vision by Francis Thompson in order to write poems about.
Where is the land of Luthany,
Where is the tract of Elenore?
I am bound therefor.
Tolkien borrows it as an Elvish name for the island of Britain in his early Book of Lost Tales myths; his original idea was that it meant 'friendship', to signify friendship between Men and Elves. But, as words tended to do in Tolkien's work, it took on a life of his own, and became better known as a name in the Elvish form he made for it: Lúthien.
In Luthany the Shadows Fall
In Luthany the shadows fall
on ruins of deserted halls
that, great of beam, still rise on high,
that, strong of stone, yet stand and wait.
The earth may fade, the sun may die,
but Luthany will stand and wait.
In Luthany the birds yet trill
with song of lark and whippoorwill;
sad nightingales remember days
as mockingbirds recall the years
when merchants traveled Luthan ways;
but only birds recall those years.
Yet someday soon will woods awake,
the hopes undie and hearts unbreak;
and then the dreaming souls will rise
to wake the sleeping land with dance.
When lives again the thing that dies,
then you and I once more will dance.