For a more "cosmopolitan" or intellectual subtitle, you could use a piece of the Latin duel between Doc and Ringo: In vino veritas ("In wine there is truth"). In pace requiescat ("Rest in peace").
" I’m your huckleberry. " (The definitive phrase for any fan of the film). subtitle Tombstone
If you are referring to an actual inscription for a physical tombstone, historical figures from the era often had distinctive epitaphs. For example, the real monument includes the humorous and surprisingly peaceful observation, " He died in bed ". For a more "cosmopolitan" or intellectual subtitle, you