The Nanteos Cup is a medieval wood mazer bowl, held for many years at Nanteos Mansion, Rhydyfelin, near Aberystwyth in Wales. Since at least the late 19th century, it has been attributed with a supernatural ability to heal those who drink from it and traditionally believed to be fashioned from a piece of the True Cross.
By the early 20th century, it had become a candidate – one of at least 200 in Europe – for the Holy Grail. Experts have found no credible reference to the cup prior to the end of the 19th century and no mention of possible connections to the Grail until 1905.