From A Wiki of Ice and Fire
The Dragon's wars was the term the maesters of the Citadel employ to refer to the ensemble of conflicts occurring during the early reign of King Aegon I Targaryen over the Seven Kingdoms of Westeros. Those conflicts were the Invasion of the Iron Islands, the Sistermen's Rebellion and the First Dornish War.
Once the war against Dorne ended in 13 AC, the realm remained at peace until Aegon's death in 37 AC. The maesters refer to this period as the Dragon's Peace.
- ↑ 1.0 1.1 Fire & Blood, Reign of the Dragon - The Wars of King Aegon I.