There was an event in Forgotten Realms called the Time of Troubles, where the Gods walked the land as mortals and some were killed off. Baldur's Gate deals with the legacy of Bhaal, who left behind a lot of mortal children during this time. The Time of Troubles event takes place in the Avatar series, starting with Shadowdale.
There are also minor appearances by prolific FR characters: Elminster the wizard who was created (along with FR itself) by Ed Greenwood. Also appearing is the dark elf Drizzt Do'Urden and his friends, created by R.A. Salvatore. You may be interested in reading books with these characters to see why they are so popular.
Post edited April 07, 2016 by WarLion108