Question: When did the city located on the north bank of the river running through North Yorkshire and Lancashire gain city status?

Context articles: Middlesbrough Borough Council
Paythorne
Metropolitan Borough of Southwark
Yorkshire and the Humber
Preston, Lancashire
South Pennine Moors
City of Preston, Lancashire
Temple Hirst
Oughtershaw
River Ribble

Middlesbrough Borough Council is the local council of Middlesbrough.
 It is a unitary authority and borough council in the Tees Valley sub-region of the North East of England.
 It is based on the town of Middlesbrough, which is often considered to spread outside the borough boundaries into neighbouring Redcar and Cleveland with a total built-up population of 174,700; the borough extends southwards to a semi-rural area.
 Whilst part of North Yorkshire for ceremonial purposes, it is in the region of North East England.
 It had a resident council population in 2001 of 134,855.
 A 2006 mid-year estimate suggests the Borough to have a population of 138,400.
 The borough council unsuccessfully bid to achieve city status in 2012, to celebrate the Queen's Diamond Jubilee.
Paythorne is a small village and civil parish in Ribble Valley, Lancashire, England.
 It is situated alongside the River Ribble, north-east of Clitheroe, and on the boundary with North Yorkshire.
 Other parishes adjacent to Paythorne are Halton West, Nappa (both in North Yorkshire), Newsholme, Horton, Gisburn, Sawley, Bolton-by-Bowland and Gisburn Forest (all in Lancashire).
 The nearest town is Barnoldswick, situated 7 km south-east of the village.
 Paythorne is on the edge of the Forest of Bowland Area of Outstanding Natural Beauty, although only a small area in the west of the parish is within the area's boundary.
 The Ribble Way long distance walk passes through the village.
The Metropolitan Borough of Southwark ("Br" [ˈsʌðɨk]) was a metropolitan borough in the County of London from 1900 to 1965.
 It was created to cover the western section of the ancient borough of Southwark and formed the northwestern part of the current London Borough of Southwark.
 In common with the rest of inner London, the borough experienced a steady decline in population throughout its existence.
 The borough council made an unsuccessful attempt to gain city status in 1955.
Yorkshire and the Humber is one of nine official regions of England at the first level of NUTS for statistical purposes.
 It comprises most of Yorkshire (South Yorkshire, West Yorkshire, the East Riding of Yorkshire including Hull, the shire county of North Yorkshire and the City of York), North Lincolnshire and North East Lincolnshire.
 It does not include Middlesbrough or Redcar and Cleveland (which are in the ceremonial county of North Yorkshire but not in the shire county).
 The population in 2011 was 5,284,000.
Preston is a city and the administrative centre of Lancashire, England.
 On the north bank of the River Ribble, it is an urban settlement and unparished area that together with surrounding rural civil parishes forms the City of Preston local government district of Lancashire.
 The district obtained city status in 2002, becoming England's 50th city in the 50th year of Queen Elizabeth II's reign.
 Preston has a population of 114,300, the City of Preston district 132,000 and the Preston Built-up Area 313,322.
 The Preston Travel To Work Area, in 2011, had a population of 420,661 compared to 354,000 in the previous census.
The South Pennine Moors are areas of moorland in the South Pennines in northern England.
 The designation is applied to two different but overlapping areas, a Site of Special Scientific Interest (SSSI) covering a number of areas in West Yorkshire, North Yorkshire, Lancashire and Greater Manchester, and a much larger Special Area of Conservation (SAC) covering parts of Derbyshire, South Yorkshire and West Yorkshire, and small areas of Cheshire, Staffordshire, Greater Manchester, Lancashire and North Yorkshire.
The City of Preston ( ) is a city and non-metropolitan district in Lancashire, England.
 On the north bank of the River Ribble, it was granted city status in 2002, becoming England's 50th city in the 50th year of Queen Elizabeth II's reign.
 The City of Preston district has a population of 141,800 (mid-2016 est. ), and lies at the centre of the Central Lancashire sub-region, with a population of 335,000.
Temple Hirst is a village and civil parish in the Selby District of North Yorkshire, England.
 It was formerly in the Barkston Ash wapentake in the West Riding of Yorkshire.
 The village is located on the north bank of the River Aire.
 In the 2011 census the population was 120.
Oughtershaw is a hamlet in the Yorkshire Dales, North Yorkshire, England.
 It lies on a road it shares with other small villages.
 Gayle, Deepdale, Yockenthwaite and Hubberholme.
 Contrary to popular belief the river running past Oughtershaw is not the Wharfe; it is Oughtershaw Beck, which runs down to Beckermonds and then merges with Greenfield Beck to source the River Wharfe at the Langstrothdale chase.
The River Ribble is a river that runs through North Yorkshire and Lancashire in Northern England.