Wairau Affray in the context of "New Zealand Company"

The South Island (Māori: Te Waipounamu [tɛ wɐ.i.pɔ.ʉ.nɐ.mʉ], lit. 'the waters of Greenstone') is the larger of the two main islands of New Zealand by surface area, the other being the smaller but more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, to the south by the Foveaux Strait and Southern Ocean, and to the east by the Pacific Ocean. The South Island covers 150,437 square kilometres (58,084 sq mi), making it the world's 12th-largest island, constituting 56% of New Zealand's land area. At low altitudes, it has an oceanic climate. The most populous cities are Christchurch, Dunedin, Nelson and Invercargill.

Prior to European settlement, Te Waipounamu was sparsely populated by three major iwi – Kāi Tahu, Kāti Māmoe, and the historical Waitaha – with major settlements including in Kaiapoi Pā near modern-day Christchurch. During the Musket Wars expanding iwi colonised Te Tau Ihu, a region comprising parts of modern-day Tasman, Nelson and Marlborough, including Ngāti Kuia, Rangitāne, Ngāti Tama, and later Ngāti Toarangatira after Te Rauparaha's wars of conquest. British settlement began with expansive and cheap land purchases early on, and settlers quickly outnumbered Māori. As a result the Wairau Affray was the only conflict of the New Zealand Wars to occur in the South Island. The island became rich and prosperous and Dunedin boomed during the 1860s Otago gold rush, which was shaped by extensive Chinese immigration. After the gold rush the "drift to the north" meant the North Island displaced the South as the most populous.

The Musket Wars were a series of as many as 3,000 battles and raids fought throughout New Zealand (including the Chatham Islands) among Māori between 1806 and 1845, after Māori first obtained muskets and then engaged in an intertribal arms race in order to gain territory or seek revenge for past defeats. The battles resulted in the deaths of between 20,000 and 40,000 people and the enslavement of tens of thousands of Māori and significantly altered the rohe, or tribal territorial boundaries, before the signing of the Treaty of Waitangi in 1840. The Musket Wars reached their peak in the 1830s, with smaller conflicts between iwi continuing until the mid-1840s; some historians argue the New Zealand Wars were (commencing with the Wairau Affray in 1843 and Flagstaff War in 1845) a continuation of the Musket Wars. The increased use of muskets in intertribal warfare led to changes in the design of pā fortifications, which later benefited Māori when engaged in battles with colonial forces during the New Zealand Wars.

Ngāpuhi chief Hongi Hika in 1818 used newly acquired muskets to launch devastating raids from his Northland base into the Bay of Plenty, where local Māori were still relying on traditional weapons of wood and stone. In the following years he launched equally successful raids on iwi in Auckland, Thames, Waikato and Lake Rotorua, taking large numbers of his enemies as slaves, who were put to work cultivating and dressing flax to trade with Europeans for more muskets. His success prompted other iwi to procure firearms in order to mount effective methods of defence and deterrence and the spiral of violence peaked in 1832 and 1833, by which time it had spread to all parts of the country except the inland area of the North Island later known as the King Country and remote bays and valleys of Fiordland in the South Island. In 1835, the fighting went offshore as members of Ngāti Mutunga and Ngāti Tama invaded and murdered the Moriori of Rēkohu in a genocide.

Te Rauparaha (c. 1760s – 27 November 1849) was a Māori rangatira, warlord, and chief of the Ngāti Toa iwi. One of the most powerful military leaders of the Musket Wars, Te Rauparaha fought a war of conquest that greatly expanded Ngāti Toa southwards, receiving the epithet "the Napoleon of the South". He remains one of the most prominent and celebrated New Zealand historical figures.

Born probably in the 1760s, Te Rauparaha's conquests eventually extended Ngāti Toa authority from Miria-te-kakara at Rangitikei to Wellington, and across Cook Strait to Wairau and Nelson. He participated in land sale and negotiations with the New Zealand Company at the beginning of the colonisation of New Zealand. An early signatory to the Treaty of Waitangi, Te Rauparaha was later central to the Wairau Affray in the Marlborough district, considered by many to be the first of the conflicts in the New Zealand Wars. Shortly before he died he led the building of Rangiātea Church in Ōtaki.

The South Island (official alternative name Te Waipounamu, from Māori) is the larger of the two main islands of New Zealand by surface area, the other being the smaller but more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, to the south by the Foveaux Strait and Southern Ocean, and to the east by the Pacific Ocean. The South Island covers 150,437 square kilometres (58,084 sq mi), making it the world's 12th-largest island, constituting 56% of New Zealand's land area. At low altitudes, it has an oceanic climate. The most populous cities are Christchurch, Dunedin, Nelson and Invercargill.

Prior to European settlement, Te Waipounamu was sparsely populated by three major iwi – Kāi Tahu, Kāti Māmoe, and the historical Waitaha – with major settlements including in Kaiapoi Pā near modern-day Christchurch. During the Musket Wars expanding iwi colonised Te Tau Ihu, a region comprising parts of modern-day Tasman, Nelson and Marlborough, including Ngāti Kuia, Rangitāne, Ngāti Tama, and later Ngāti Toarangatira after Te Rauparaha's wars of conquest. British settlement began with expansive and cheap land purchases early on, and settlers quickly outnumbered Māori. As a result the Wairau Affray was the only conflict of the New Zealand Wars to occur in the South Island. The island became rich and prosperous and Dunedin boomed during the 1860s Otago gold rush, which was shaped by extensive Chinese immigration. After the gold rush the "drift to the north" meant the North Island displaced the South as the most populous.

Te Rangihaeata (c. 1780s – 18 November 1855) was a Ngāti Toa chief and a nephew of Te Rauparaha. He played a leading part in the Wairau Affray and the Hutt Valley Campaign.