The Reign of the Usurper

The Reign of the Usurper refers to a timeline in Westeros' past where the Targaryen Dynasty no longer ruled. The Realm was instead ruled by House Baratheon of Storm's End. The Head of House Baratheon, Robert Baratheon, led the rebellion against Aerys Targaryen in 283 AL. Robert succeeded after defeating Aerys' son, Rhaegar at the Trident.

A Dark Age
After Robert Baratheon came into rule, the Realm saw a relative peace for seventeen years, until the death of Jon Arryn, Robert Baratheon's Hand of the King. The events slowly escelated and the death of Eddard Stark at the hands of Joffrey Baratheon began the war of the Five Kings. With Joffrey in a ruling position, five kings fought for power, and slowly they widdled away, until Aegon Targaryen and Daenerys Targaryen landed and finished the Reign of the Usurper by incinerating Cersei and Tommen Lannister in the Red Keep with Dragonfire.