Poisoned Chalice

Poisoned Chalice is associated with Saint John the Evangelist. Early Christian art usually represents St. John with an eagle, symbolizing the heights to which he rises in the first chapter of his Gospel. The chalice as symbolic of St. John, which, according to some authorities, was not adopted until the thirteenth century, is sometimes interpreted with reference to the Last Supper, again as connected with the legend according to which St. John was handed a cup of poisoned wine, from which, at his blessing, the poison rose in the shape of a serpent. Perhaps the most natural explanation is to be found in the words of Christ to John and James: My chalice indeed you shall drink. (Matthew 20:23). http://www.newadvent.org/cathen/08492a.htm