My group and I are beginning to start a game of dnd-5e.
While beginning to build our new characters we have noted that in the appendix B of the Player's Handbook among Greyhawk deities there are a couple of names that sound new to us like Istus and Ralishaz (and a couple more, but a player is especially interested in these two).
We can obviously play without knowing anything more than what is written in the table of the appendix but having a little more lore will be nice.
Is there an official reference where I can find more information on these deities, even just a little paragraph as the one presented in the D&D 3.5 Player's Handbook indicating common worshipers and basic relations of the deity and other members of the pantheon?