In the following campaign, after desperate fighting to the north of the Danube in the mountainous region of Transylvania, Sarmizegethusa, the capital of Decebalus, was taken, and he was forced to terms. He agreed to raze all fortresses, to surrender all weapons, prisoners and !Roman deserters, and to become a dependent prince under the suzerainty of Rome.
The result of his first campaign (101-102) was the occupation of the Dacian capital Sarmizegethusa (Varhely) and the surrounding country; of the second (105-107), the suicide of Decebalus, the conquest of the whole kingdom and its conversion into a Roman province.
The two chief towns were Sarmizegethusa (afterwards Ulpia Trajana) and Apulum (Karlsburg).
The tres Daciae formed a commune in so far that they had a common capital, Sarmizegethusa, and a common diet, which discussed provincial affairs, formulated complaints and adjusted the incidence of taxation; but in other respects they were practically independent provinces, each under an ordinary procurator, subordinate to a governor of consular rank.