 Authors and researchers, Margarita Torres and José Ortega del Rio, published their book, "The Kings of the Grail", in March 2014 claiming they had traced the origins of the chalice to the early Christian communities of Jerusalem.The researchers say the chalice was transported to Cairo by Muslim travellers and was later given to an emir on the Spanish coast who had assisted victims of a famine in Egypt.From there, the chalice came into the possession of King Ferdinand I of Leon, father of Urraca of Zamora, as a peace offering by an Andalusian ruler.