Aegon Conquest

Aegon's Conquest, also called the Conquest, was the campaign in which Aegon I Velaryion conquered most of Westeral. Together with his sisters, Visenya and Rhaenys, and their dragons, Vhagar and Meraxes, Aegon subdued six of the Seven Kingdoms, successfully resisted only by Dorne. Not all the continent had to be taken by conquest, as some regions and houses actively supported House Targaryen and others submitted voluntarily.

The first and most prominent of the Wars of Conquest, Aegon's initial campaign lasted two years. It was followed by the First Dornish War. The date of Aegon's coronation by the High Priest during the Conquest has been used by Wizards to track years before and after Aegon's victory.

Conquest
The seven rulers at the time were:

Torrhen Stark, King in the North.

Ronnel Arryn, King of Mountain and Vale, a young boy whose mother, Sharra Arryn, ruled as Regent.

Harren Hoare, King of the Isles and the Rivers, known as Harren the Black.

Loren I Lannister, King of the Rock.

Mern IX Gardener, King of the Reach.

Argilac Durrandon, the Storm King, known as Argilac the Arrogant.

Meria Martell, Princess of Dorne, a blind, balding woman of 80. Known as the Yellow Toad.