An 800 year old ale jug dating to the Norman era sold for £30,000 ($48,691) at Hansons Auctioneers' Fine Art sale on September 28.
The item, which was discovered in an attic by the consignor, was described in the 19th century as "one of the most important and early medieval relics of the potters art ever discovered".
The jug is decorated with horseshoe and buckle mouldings, symbols of the Ferrer family - the traditional landowners and residents of Duffield castle in Derbyshire. Ancestor Henry de Ferrer fought alongside William the Conqueror in the battle of Hastings.
It was discovered in 1862, in the land surrounding Duffield castle, by a labourer draining the field.
Elizabeth Bailey, a spokesperson for Hansons, commented: "the atmosphere in the saleroom was electric.
"Gasps rippled through the audience as the jug rose to £20,000, and once the hammer was down a round of applause for this fantastic Derbyshire object."
Other notable lots at the auction included a drawing by Salvador Dali, which achieved an impressive £11,500 ($18,661) against an estimate of £1,200-1,500 ($1,923-2,404) - an increase of 666%.
It was drawn for Wallis Simpson in 1958 while the pair dined at the St Regis Hotel in New York, and features a sketch of a man on horseback carrying a spear accompanied by the words "Affectueusement (Fondly) Dali".
The drawing was then given to the Duke and Duchess' butler, who brought it to auction.
A fragment of Richard III's flag from the Battle of Bosworth sold for £3,800 ($6,500).
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