In about December 1768, or six months before Cook's visit, war broke out in the island, and Amo was totally defeated by the chief who governed the eastern peninsula. Cook saw at Papara, on the south side of the main island, the relics of this battle in the shape of many human bones. Tootaha, who had joined in the war against his brother, became regent for the son (Pomare) of another brother, Hapai, and was therefore the principal man in the island when Cook appeared. Notwithstanding, when Amo (whom Cook calls Oamo), came to visit the Europeans on 21st June, bringing his young son, Temare, with him, the latter was carried on men's shoulders, which was one of the ceremonial observances due to the Otou, or young king, and the natives present recognised his royal character by uncovering their shoulders.

Tupia (or Tupaia), who left the island with Cook, was the chief priest of the island, and had been living with Bereia; but having shortly before conspired to kill Tootaha, it is probable that he felt his life was unsafe in the island.

Frequent wars raged in the island for many years after Cook's first visit. Tootaha was killed in one of these, and when Cook again arrived, in 1773, Pomare was king, though Cook only knew him by his title of Otou, which he apparently still retained, though there was no regent.

In 1789 Captain Bligh called at Tahiti in the Bounty, to export young bread-fruit trees to the West Indies. The delights of Tahiti probably had their part in bringing about the well-known mutiny a few days after the ship left; and on the return of the Bounty with her crew of mutineers, sixteen of them remained on the island. These men took a leading part in the continual dissensions in the island, until, in 1791, they were carried off by the Pandora, sent with the object of capturing the mutineers.