When the Alamarri peoples first split from Neromenians and migrated southeast in -1220 TE, they found a new homeland and called it "Ferelden", which means "fertile valley" in their tongue. However, the fertile valley did not become a nation for another 2800 years. This period of time is littered with numerous wars the Alamarri tribes waged, both with foreign powers such as the Tevinter Imperium and Orlais, as well as their fellow tribes. During that time the Alamarri developed their own political system which remains largely intact to this day. With time, powerful nobles would turn their land into bannorns, then arlings, and finally teyrnirs. The nobles continued the Alamarri tradition of infighting and continued to fight with each other over petty and personal matters in order to gain more power. A few of the most powerful nobles put forward their bid for kingship over the Alamarri, but without success.
Then in the Exalted Age came a man named Calenhad who was born to a merchant. Through a series of events he got involved in the war for kingship, during which time he first became a servant to one of the candidates for the throne. When his master decided to use him to gain advantage against other nobles, Calenhad acted honourably; and through his actions gained respect and command of the armies of his former master. He married his master's noble daughter, and became a teyrn—and a candidate for king himself.
As he was leading his men more joined his side, for he was known to be more honourable than other true nobles. Calenhad also gained followers in the Circle of Magi, as well as the Ash Warriors. By then, the Chantry had become very popular in other lands. Calenhad gained the trust of those amongst the Alamarri who followed the faith, as he was said to be a devoted Andrastian himself.
In 5:42 Exalted a Landsmeet was called and Calenhad made an appearance with his army, including mages of the Circle, templars and the Ash Warriors. With allies at his side, Calenhad challenged the biggest threat to his rule, the most powerful noble—Simeon, the teyrn of Denerim. Calenhad was matched in combat and wounded, but ultimately defeated Simeon. The nobles voted him king, and the fertile valley became the nation of Ferelden. Calenhad Theirin started the royal family of Theirins who sat on the Fereldan Throne for the next three centuries.