... honor his father. The invocation takes place at the tomb of Agamemnon, his father. There are lots of others. Here's one from tyhe medieval grimoire, "Picatrix". http://www.renaissanceastrology.com/picatrixmercuryinvocation.html "Mercury, noble lord, you who are truthful, sensible, intelligent, you who, like the scribes, know and spread arithmetic, calculation, the science of the ...