As reported by The Daily Mail, The BBC, The Telegraph, and The New York Times, among others, a Roman sarcophagus (or at least, the front slab of one) has been discovered on the grounds of Blenheim Palace, where it has spent the last century in service as a tulip planter.
This lenoid piece (a coffin shaped like a lenos: a wine vat) features the lions-head bosses typical for this shape, while the figural frieze itself — a Dionysiac scene of the inebriated god approaching the sleeping form of his beloved Ariadne, her own pose echoed by that of Hercules reclining boozily at left (an unusual addition) — plays on the lenos's associations with wine.
The dates reported for the piece are a mess. Most of the sources above describe it as "dating back to A.D. 300" or "300 AD" — but then go on to quote spokesmen who place the carving in the 2nd century (i.e., well over a century earlier), with no notice of the resulting chronological inconsistency.
In truth, neither set of reported dates can be correct. AD 300 is far too late for this work. But the 2nd century is just as clearly too early, as an eye to the carving technique reveals. (Just look at the drill-heavy treatment of the lions' manes.) A 3rd-century date, tilting earlier rather than later — the 220s AD, or perhaps even the 230s — seems most likely.