The Watership Down thread has reminded me of Mr Keyes' (relatively obscure) existence; he did the poem that (IIRC) starts off the Efrafa chapter, which goes:
He said "Dance for me," and he said
"You are too beautiful for the wind
To pick at, or the sun to burn," he said
"I'm a poor, tattered thing, but not unkind
To the sad dancer and the dancing dead."
(
Poor Sidney... )