I would like to find and read the lore of gods and dragons of Greyhawk — how they were originally created, how they have changed, and so on.
I searched a bit but I couldn't find anything. What book or books contain background information on the origins of the gods and dragons?
As the comments say, I do not want to know/find out how gods and dragons evolved by the writers but how they evolved in the world of GH. How gods/immortals started, how evolved, how the dragons are connected to gods etc.
I have seen bits of such information (e.g. the "war" against Tharizdun or the creation of Drakes) but on one hand I do not know if they are not home brewed (i.e. because I have seen them in random blogs they could be just a story of the blogger) and on the other what is the greater story and how are connected all together.