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
Republican Party of Dahomey which was to be the Dahomeyan branch of the African Regroupment Party. However, internal disagreements led to the parties splitting back into their original forms in 1959. The PRD also won the 1959 elections, despite receiving fewer votes than the Dahomeyan Democratic Union (UDD). Due to accusations of fraud, it later agreed to give nine seats to the UDD, but remained the largest party in the Assembly. In February 1960 it was transformed into the Dahomey Nationalist Party ("Parti des Nationalistes du Dahomey", PND) after admitting federalists led by Émile Derlin Zinsou. In November 1960 the PND agreed to merge