My inspiration for this part came from a very interesting book I once read. Osunt förnuft by Olav Hammer, a professor of History of Religions (unfortunately I don't think it's available in other languages than Swedish). It's about cognitive fallacies, false memories and other aspects of the human mind that have to do both with our religious imagination and with everyday life. He mentions that we are programmed to find patterns and connections in our surroundings and this ability is, due to natural selection, a bit hyper-active. That means that we see patterns and connections even if there aren't any (better to see one enemy too much than one too less).
I guess most of you know this, but during what is called "the Greek Dark Ages" (ca. 1200–800 BCE), the Linear B writing used by the Mycenaeans seems to have been forgotten. It wasn't until the 8th century that a new alphabet system was adopted from the Phoenicians. Apparently, Hades didn't bother to learn anything about what the societies of humans in Greece were like, before he talked to those who would become his priests. He assumed not much had changed since he left earth for the Underworld.