Chalice of Doña Urraca

The Chalice of Doña Urraca is a jewel-encrusted onyx chalice kept at St. Isidore's Basilica in León, Spain, which belonged to infanta Urraca of Zamora, daughter of Ferdinand I of Leon.

In March 2014, Spanish authors Margarita Torres and José Ortega del Rio asserted the chalice could be the purported Holy Grail. The claim was met with disbelief by some historians and specialists, who claim the materials and techniques used in the chalice indicate a mid-11th century origin, however; the allegations led to unprecedented crowds swarming to the Basilica to see it, which led to the setting aside of a separate exhibition room only for the chalice.