Ancient Roman Marble Slab, used as a horse mounting block for a decade, has drawn researchers' attention as a mystery when it was found in the garden of a Bungalow in England. 

The detailed slab contains the Greek Inscription that gives us an idea of its origin and is estimated to be from the Second Century AD. But its most recent travels have baffled specialists.

House owner living in Whiteparish, a village in southern England, found it in her garden's rockery, stumbled the slab 20 years ago.

She used the slab as a mounting block in her stable for almost 10 years before suddenly finding a laurel wreath cut into its top, according to a press release from auction house Woolley and Wallis, which is selling the rock.

Objects including rock also arrived in England in the 18th and 19th centuries when wealthy aristocrats visited Europe learning about ancient art and history, Will Hobbs, an antiquities expert at Woolley and Wallis, said.

"We assume that is how it entered the UK, but what is a complete mystery is how it ended up in a domestic garden, and that's where we'd like the public's help," Hobbs said in a statement.

When the owner noticed the details on slab, she took it to archaeologis who confirmed its origin to be in Greece or Anatolia dating back to second century AD.

"The people (and) the Young Men (honor) Demetrios (son) of Metrodoros (the son) of Leukios," the inscription on the slab reads.

The slab is expected to be sold in February with a pre-sale estimate of up to £15,000 ($20,300).

Auctioneers are seeking answers on how the slab was discovered in the peaceful English backyard. They have been asking the local residents if they know someone who lived in the neighborhood in recent decades.

They are also wondering whether anyone involved in the construction of Bungalow might "recall the origins of some of the rubble used."

"There are several possibilities of where the stone might have originated," Hobbs said.

"Both Cowesfield House and Broxmore House were very close to Whiteparish and were demolished in 1949 after having been requisitioned by the army during the war. But we also know that the house at what is now Paulton's Park was destroyed by fire in 1963 and so possibly rubble from there was reused at building sites in the area shortly after."