FEBA - Sdly cannot take credit for egg banjo thing, came from a fishhead mate.
As you asked.
According to A Cozy Book of Breakfasts and Brunches (Prima Publishing, 1996), "many years ago" a Wall Street financier named LeGrand Benedict, a regular patron of Manhattan's ritzy Delmonico's restaurant, complained that there was nothing new on the menu. The chef's response was this dish. A variant myth credits, instead of the chef, the Delmonico maitre d' and Mrs. Benedict. The name of the chef, and indeed any real facts about the genesis of eggs Benedict, are lost to history. The new Joy of Cooking (Scribner, 1997) dates the dish in the 1920s, and says the original base may have been toast.