It was, after Haapai, the second island group of Tonga Tāufaāhau obtained in his way towards being king of all Tonga. It was therefore still in Vavau, in fact at Pouono, on 20 November 1839 that Tāufaāhau declared himself king of Tonga and ceded it then to the new Christian god.
After Haapai, which was the second island group of Tonga that Tāufaāhau secured as part of his ambition to rule all of Tonga, he declared himself king on 20 November 1839 at Pouono in Vavau. He then transferred Tonga to the new Christian deity.