Cormanthor (Myth Drannor) is founded
Raised during the golden age of the Empire of Netheril, this enclave would come to be known as The City of Shade
The Netherese archmage Karsus attempted to steal the knowledge and power of Mystral, the then goddess of magic. He succeeded in doing so but it forced Mystral to kill herself in order to save the Weave. For several moments thereafter, magic across the Realms faltered, causing the Netherese floating cities to plummet to the ground, thus ending their long lasting empire.
Just days before Karsus cast Karsus's Avatar and temporarily destroyed the Weave, Lord Shadow successfully shifted the entire city into the Plane of Shadow, avoiding destruction.
The smattering of human settlers that huddled in small villages at the edges of Cormanthor and Cormanthyrian led by Coronal Eltargrim Irithyl came to an agreement known as the Dales Compact. The conditions of this pact gave the future-Dalesfolk non-forested, and non-elven claimed areas of land on which to settle and ceased any and all logging efforts deeper into the forest. Furthermore, the Standing Stone was erected as a monument to this new alliance between elf and man. This turning point in both civilizations also marked the beginning of the Dale Reckoning calendar for centuries to come.
Akh'Velahr (the army of Cormanthor) was defeated by the invading demonic forces named the Army of Darkness, leading to the fall of the elven city of Myth Drannor, the greatest and most powerful bastion of civilization by far at the time.
Most scholars believed that the Era of Upheaval started with the calamitous event known as the Time of Troubles, that took place in 1358 DR, when the gods were cast down from the Upper planes and roamed the land incarnated as mortals. The chaos of the Time of Troubles left a lasting mark into the world.
The Time of Troubles was a period during which the deities of Faerûn were forced to walk the earth in their mortal avatar forms
Mystra, greater goddess of magic and among the most powerful of the gods, was in turn destroyed when she attempted to bypass Helm at the Celestial Stairway.
The cavern that Skullport was build in collapses destroying much of the city