Given Rancid_Pickel's w/u above, I offer a question:
  • As the Fisher King, keeper of the Grail, is given the Welsh name Bran, and "bran" in Welsh is "crow," Latin "corvus," and is sometimes depicted as being entwined by a snake (particularly in the Vulgate, IIRC);
  • As the word "grail" is derived from "graal," a shortened form of "gradale," which is derived from the Latin "crater," derived from the Greek "krater;"
  • That the grail hero Perceval has been identified by a number of scholars with the figure of Mabon ap Modron, and Mabon is equated with Apollo;

Is it then possible that the legend behind these two constellations--corvus and crater--is related to the Celtic grail legend?