Pōmare II (?–1850) was originally called Whiria. He was a Māori rangatira (chief) of the Ngāpuhi iwi (tribe) in New Zealand and the leader of the Ngāti Manu hapu (subtribe) of the Ngāpuhi. He was the nephew of Pōmare I. His mother, Haki, was the elder sister of Pōmare I. When he succeeded his uncle as leader of the Ngāti Manu he took his uncle’s names, Whetoi and Pōmare, so that he is referred to as Pōmare II to distinguish him from his uncle.
Henry Williams, William Williams and other members of the Church Missionary Society (CMS) came over the bay from Paihia to attempt to mediate an end to the fighting. The mediation efforts appeared promising with the missionaries believing that the chiefs would accept that the plunder of the kūmara gardens at Kororāreka would suffice as satisfaction of the earlier insults to Pehi the daughter of Hongi Hika and Moewaka, the daughter of Rewa (the reason the battle is called the Girls’ War). However, further fighting occurred, which resulted in the death of Hengi, a chief of Whangaroa. Eventually Henry Williams persuaded the warriors to stop the fighting. Reverend Samuel Marsden had arrived on a visit and over the following weeks he and Henry Williams attempted to negotiate a settlement in which Kororāreka would be ceded by Pōmare II as compensation for the death of Hengi, which was accepted by those engaged in the fighting.
Pōmare II strengthened his pā at Otuihu to make it impregnable against any attack by the northern hapu of the Ngāpuhi who now controlled Kororāreka and he also worked to promote trade with the Europeans, who were described by Samual Marsden as "generally men of the most infamous character: runaway convicts, and sailors, and publicans, who have opened grogshops in the pas, where riot, drunkenness, and prostitution are carried out daily".