The owners of what is said to be the “Welsh Holy Grail” are offering a reward for its safe return after the cup was stolen.
The Nanteos Cup was stolen from a home in Weston Under Penyard near Ross on Wye in Herefordshire.
West Mercia police described the dark wood cup as “a medieval mazer bowl, a wooden cup/chalice”, and said it was kept in a blue velvet bag.
The family which owns the cup are offering a £1,000 reward and West Mercia Police are offering an additional £1,000 for the safe return of the cup and information leading to the arrest and subsequent conviction of the offender or offenders.
The BBC reported that it is claimed to be the cup from which Christ drank at the Last Supper, and that it had been loaned to an ill woman because it is believed to have healing powers. Thieves are thought to have struck while she was in hospital.
Parts of the cup were bitten off by the sick in the hope of being cured, the Independent reported.
Anyone with any information about the burglary, which took place between July 7 and 14 2014, is asked to call West Mercia Police on 101, quoting incident number 146s of July 2014.