Eisen, Gustavus A., The great chalice of Antioch, New York, Fahim Kouchakji, 1933. Eisen, Gustavus A., The great chalice of Antioch, on which are depicted in sculpture the earliest known portraits of Christ, apostles and evangelists, New York, Kouchakji frères, 1923. Metropolitan Museum
A 2014 Guardian article on the Chalice of Doña Urraca mentions in passing that "In Europe alone there are 200 supposed holy grails, the Spanish researchers admitted." "Crowds flock to Spanish church after holy grail claim". The Guardian. London. 31 March 2014. Retrieved 6 August 2014.
"The great church is called San Lorenzo, and it is very remarkable, particularly the porch. They keep in it the Holy Grail, which is made of a single emerald and is indeed a marvellous relic," Pedro Tafur, Andanças e viajes.
