Researchers in Spain believe they've solved the centuries-old question over the location of the Holy Grail, the cup from which Jesus Christ was said to have drunk from during the Last Supper. In a new book, Margarita Torres and Jose Ortega del Rio conclude that the chalice sits in a church in northern Spain.

Here's more on their findings from The Irish Times:

The onyx chalice itself, they explain, is contained within another, antique cup known as the Chalice of Doña Urruca, which sits in León’s basilica of Saint Isidore. The historians say it has been there since the 11th century.

“This is a very important discovery because it helps solve a big puzzle,” Ms Torres told The Irish Times . “We believe this could be start of a wonderful stage of research.”

She said the duo had initially been researching the history of some Islamic remains in the Saint Isidore basilica. However, their discovery of two medieval Egyptian documents which mentioned the chalice of Christ caused them to change course.

Those parchments told of how Muslims took the sacred cup from the Christian community in Jerusalem to Cairo. It was then given to an emir in Denia, on Spain’s Mediterranean coast, in return for help he gave to Egyptians who were suffering a famine.