X
Ah! what a poem.........
He lies in tin,
he lies in mahagony,
he lies in lead and more of lead,
he lies in ebony,
he lies in oak.
&
He lies in Y under the dome of Z.
give me the X and Z.
ANSWER
X- Napolean
Z- Les invalides
both puneet and suchir got it right, but the relevance of my poem :) which none of them mentioned was that Napolean is buried in 6 coffins made of tin, mahaogny,ebony,oak and lead.