In Apollodorus 3.4.1, there is a passage, "The god told him not to trouble about Europa, but to be guided by a cow, and to found a city wherever she should fall down for weariness." The god in question is not currently hypertext but plain text - do we want to leave it this way, or make the assumption that this is associated with a particular god? I did a bit of research and in the Cadmus myth there doesn't seem to be any particular mention of what god tasked him with his mission, but since this passage takes place at the oracle in Delphi, the most likely god would probably be Apollo. I wouldn't worry too much about it, I usually only tag it if the particular god is mentioned (and in case anyone reading needs to make sure they are aware who is being talked about if they want to check). If it's not mentioned specifically we should probably just leave it alone since it's not terribly crucial anyway