Dahomey conquered Allada, the origin for the royal family according to oral tradition, and in 1727 he conquered Whydah. This increased size of the kingdom, particularly along the Atlantic coast, and increased power made Dahomey into a regional power. The result was near constant warfare with the main regional state, the Oyo Empire, from 1728 until 1740. The warfare with the Oyo empire resulted in Dahomey assuming a tributary status to the Oyo empire. Tegbesu, also spelled as Tegbessou, was King of Dahomey, in present-day Benin, from 1740 until 1774. Tegbesu was not the oldest son of King Agaja (1718–1740), but
Dahomey to the field commander with the reason given that if any spirit were to punish the commander for decisions it should not be the king. Unlike other regional powers, the military of Dahomey did not have a significant cavalry (like the Oyo empire) or naval power (which prevented expansion along the coast). The Dahomey Amazons, a unit of all-female soldiers, is one of the most unusual aspects of the military of the kingdom. The Dahomean state became widely known for its corps of female soldiers. Their origins are debated; they may have formed from a palace guard or from gbetos