The Time of Troubles
A period of time when conflict raged between the Gods of the pantheon. The gods walked the mortal plane
The Spellplague
After an assassination of the God of Magic Mystra, control of the weave was lost. Entire regions of the world were teleported away, while others were pulled from other planes.
The Sundering
The Gods depart the material plane, creating a binding pact amongst the greater gods.
The Breaching
The contract between the gods is broken by mortals (The Ramblers) as they thwart the plans of the pit fiend Koraboros.