Question: On which island of New Zealand is the city where Diocletian is from located?
Context: Diocletian was a New Zealand extreme metal band from Auckland.  Formed in 2004, the band's final lineup featured Atrociter (guitar, vocals), L. Muir (guitar, vocals, bass), C. Sinclair (drums) and J. Baldwin (guitars).  The band's 2015 album, "Gesundrian", was featured as number 15 on Pitchfork's list of "The Best Metal Albums of 2014". Auckland ( ) is a city in New Zealand's North Island.  Auckland is the largest urban area in the country, with an urban population of around 1,495,000 .  It is located in the Auckland Region—the area governed by Auckland Council—which includes outlying rural areas and the islands of the Hauraki Gulf, resulting in a total population of 1,614,300 .  A diverse and multicultural city, Auckland is home to the largest Polynesian population in the world.  The Māori language name for Auckland is "Tāmaki " or "Tāmaki-makau-rau ", meaning "Tāmaki with a hundred lovers", in reference to the desirability of its fertile land at the hub of waterways in all directions.  It has also been called "Ākarana", the Māori pronunciation of the English name. Cheeseman Island is a 7.6 ha rocky volcanic island in the southwest Pacific Ocean (located at ).  It is named after Thomas Frederick Cheeseman of the Auckland Museum - who was on board the New Zealand Government steamer 'Stella' when it visited the island in 1887.  Partly named after Matthew Cheeseman who was first to map the island with his brother.  It neighbours Curtis Island to the east and lies about 20 km south of Macauley Island.  They are part of the Kermadec Islands, a straggling outlying island group of New Zealand.  The Kermadec Islands lie halfway between the North Island of New Zealand and Tonga at approximately the latitude of the Gold Coast, Queensland. New Zealand (Māori: Aotearoa ] ) is an island country in the southwestern Pacific Ocean.  The country geographically comprises two main landmasses—the North Island (or "Te Ika-a-Māui"), and the South Island (or "Te Waipounamu")—and around 600 smaller islands.  New Zealand is situated some 1500 km east of Australia across the Tasman Sea and roughly 1000 km south of the Pacific island areas of New Caledonia, Fiji, and Tonga.  Because of its remoteness, it was one of the last lands to be settled by humans.  During its long period of isolation, New Zealand developed a distinct biodiversity of animal, fungal and plant life.  The country's varied topography and its sharp mountain peaks, such as the Southern Alps, owe much to the tectonic uplift of land and volcanic eruptions.  New Zealand's capital city is Wellington, while its most populous city is Auckland. BATS Theatre is New Zealand's leading venue for the development of new theatre practitioners and plays.  The recently renovated venue has three intimate performance spaces and is located in the central city of the country's capital, Wellington.  Most of the productions at BATS Theatre are New Zealand works.  Ninety per cent of its annual programme of 60 to 70 shows are New Zealand and world premieres.  BATS is largely funded by Creative New Zealand and Wellington City Council.  The name BATS is an acronym of Bane & Austin Touring Society. The biodiversity of New Zealand, a large island nation located in the southwestern Pacific Ocean, is varied and distinctive accumulated over many millions of years as lineages evolved in the local circumstances.  Recently a component has been introduced by humans.  New Zealand's pre-human biodiversity exhibited high levels of species endemism, but has experienced episodes of biological turnover.  Global extinction approximately 65 Ma ago, resulted in the loss of fauna such as dinosaurs, pterosaurs and marine reptiles e.g. mosasaurs, elasmosaurs and plesiosaurs.  The ancient fauna is not well known, but at least one species of terrestrial mammal existed in New Zealand around 19 Ma ago.  For at least several Ma before the arrival of human and commensal species, the islands had no terrestrial mammals except for bats and seals, the main component of the terrestrial fauna being insects and birds.  New Zealand has developed a national Biodiversity Action Plan to address conservation of considerable numbers of threatened flora and fauna within New Zealand. Wallaceville is a suburb of Upper Hutt located in the lower North Island of New Zealand.  It is named after John Howard Wallace (1816–91), an early New Zealand settler, local body politician, businessman and author of one of the first published histories of New Zealand.  It is home to the oldest surviving wooden blockhouse in New Zealand, and is served by Wallaceville Railway Station. George Nicholson (3 August 187813 September 1968) was a New Zealand rugby union footballer who played for New Zealandthe "All Blacks"between 1903 and 1907.  He played club rugby in Auckland for the City club, before making his provincial debut for Auckland in 1901.  After playing for the North Island in 1902, he was selected for New Zealand's tour of Australia in 1903 where he played in the All Blacks' first ever Test matchagainst Australia in Sydney.  The following year he was selected for New Zealand when they played a one-off Test against the British Isles who were touring New Zealand; New Zealand's first home international.  In 1905 and 1906 he was selected for the All Blacks tour of Europe and North America.  This was the first New Zealand national team to tour the Northern Hemisphere, and played 20 matches during the trip, but did not appear in any internationals.  After returning to New Zealand he switched clubs to Ponsonby in 1907, and that year played two Tests for New Zealand against Australiahis last matches representing his country.  After retiring from rugby he was involved in the sport as a referee, selector and administrator.  He was one of the last surviving members of the "Original All Blacks", as the 1905 team was called, and was present at the 75th jubilee celebrating for the formation of the New Zealand Rugby Football Union in 1967. The Air Force Museum of New Zealand, formerly called The Royal New Zealand Air Force Museum, is located at Wigram, the RNZAF's first operational base, in Christchurch, in the South Island of New Zealand.  It opened on 1 April 1987 as part of the celebrations for the RNZAF's 50th anniversary, and is primarily a museum of the Royal New Zealand Air Force, its predecessor, the New Zealand Permanent Air Force and New Zealand squadrons of the Royal Air Force.  The Air Force Museum of New Zealand's mission is to preserve and present the history of New Zealand military aviation for commemoration, learning, inspiration and enjoyment. The New Zealand outlying islands comprise nine island groups, located in the subtropics and subantarctic, which are part of New Zealand but lie outside of the New Zealand continental shelf.  Although considered as integral parts of New Zealand, seven of the nine island groups are not part of any region or district, but are instead designated as "Area Outside Territorial Authority".  The two exceptions are the Chatham Islands, which form a special territorial authority (island council) themselves, and the Solander Islands, which are part of the Southland Region and Southland District.
Answer: North Island