Question: Thomas Bignold was the founder of a company that was originally established in what year?

full_context: Document 1: Thomas Bignold: Thomas Bignold (1761–1835) was the founder of Norwich Union, now known as Aviva plc, one of the United Kingdom's largest insurance businesses.
Document 2: Esurance: Esurance Insurance Services, Inc. is an American insurance company. It sells auto, home, motorcycle, and renters insurance direct to consumers online and by phone. Its primary competitors are other direct personal insurance writers, mainly GEICO and Progressive. Founded in 1999, the company was purchased by Allstate in 2011, and is now a wholly owned subsidiary of Allstate.
Document 3: The Automobile Association: AA plc (The AA, originally The Automobile Association) is a British motoring association founded in 1905, which currently provides car insurance, driving lessons, breakdown cover, loans, motoring advice, road maps and other services. The association demutualised in 1999, to become a private limited company, and in 2002, the AA Motoring Trust was created to continue its public interest and road safety activities. The company is listed on the London Stock Exchange, and is a constituent of the FTSE 250 Index.
Document 4: North British and Mercantile Insurance: The North British and Mercantile Insurance Company was a British-based company founded in 1809 in Edinburgh and absorbed as a subsidiary of the Commercial Union in 1959. The company was also known as the North British Insurance Company, North British Fire Office and North British Fire Insurance Company.
Document 5: Old Mutual: Old Mutual plc is an international investment, savings, insurance, and banking group. Established in 1845 in South Africa, it had more than 19 million customers and £394.9 billion assets under management as of 31 December 2016. It is listed on the London Stock Exchange and Johannesburg Stock Exchange and is a constituent of the FTSE 100 Index.
Document 6: Norwich Union: Norwich Union was the name of insurance company Aviva's British arm before June 2009. It was originally established in 1797. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index.
Document 7: American Income Life Insurance Company: American Income Life Insurance Company (formerly NASDAQ: AINC), based in Waco, Texas, provides supplemental life insurance to labor unions, credit unions, and associations. American Income Life (AIL) was founded in 1951. The company's executive offices have been located in Waco, Texas, since 1959. American Income Life is licensed in 49 states, the District of Columbia, Canada, and is registered to carry on business in New Zealand. AIL also has two wholly owned subsidiaries: National Income Life Insurance Company, licensed in the state of New York, and Union Heritage Life Assurance Company Limited, licensed in the Republic of Ireland.
Document 8: Bao Viet Holdings: Bao Viet (also Bao Viet Holdings Vietnamese: "Tập đoàn Tài chính-Bảo hiểm Bảo Việt" ) is the largest Vietnamese insurance company and Vietnam's seventh largest listed company by market capitalisation. It is state-owned and has a strategic partnership with HSBC, which also holds 18% of Bao Viet's shares. HSBC is, however, soon to be replaced by Sumitomo Life. Besides various insurance products, Bao Viet has diversified into stock market trading, fond management and real estate. It also has subsidiaries in banking, hotels and construction. Bao Viet has been losing market shares in recent years and has also been making losses in the insurance sector since 2009.
Document 9: Prudential Headquarters: Prudential Financial, as it is known today, began as The Widows and Orphans Friendly Society in 1875. For a short time it was called the Prudential Friendly Society, and for many years after 1877 it was known as the Prudential Insurance Company of America, a name still widely in use. Based in Newark, New Jersey, the company has constructed a number of buildings to house its headquarters downtown in the Four Corners district. In addition to its own offices, the corporation has financed large projects in the city, including Gateway Center and Prudential Center. Prudential has about 5,200 employees in the city.
Document 10: Simply Business: Simply Business is the trading name of Xbridge Ltd. It is the UK's largest online business insurance broker with 420,000 customers. The company has been featured in the Sunday Times Tech Track 100 four times and in 2015 and 2016 won The Sunday Times 100 Best Companies to Work For.
Document 11: The Equitable Life Assurance Society: The Equitable Life Assurance Society (Equitable Life), founded in 1762, is a life insurance company in the United Kingdom. The world's oldest mutual insurer, it pioneered age-based premiums based on mortality rate, laying “the framework for scientific insurance practice and development”
Document 12: Friends Provident: Friends Provident was an organisation offering life insurance based in the United Kingdom. It was founded as a mutual Friendly Society for Quakers, although it was demutualised in 2001 and became a publicly listed company, no longer linked with the Religious Society of Friends. On 29 March 2011 Friends Provident changed its trading name to Friends Life, although its registered name remains as Friends Provident.
Document 13: Standard Life Aberdeen: Standard Life Aberdeen plc is an investment company with headquarters in Edinburgh and operations around the globe. In March 2017, Standard Life reached an agreement to merge with the investment company Aberdeen Asset Management. Standard Life was renamed Standard Life Aberdeen on 14 August 2017. It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index.
Document 14: NRAM Limited: NRAM Limited (previously Northern Rock (Asset Management) plc and NRAM plc) is a British asset holding and management company which was split away from the Northern Rock bank in 2010. It is currently under public ownership, due to the bank's nationalisation in 2008. The company continues to service a residential mortgage book of approximately £50 billion.
Document 15: Northern Rock: Northern Rock, formerly the Northern Rock Building Society, was a British bank. Based at Regent Centre in Newcastle upon Tyne, United Kingdom, Northern Rock was originally a building society. It demututalised and became Northern Rock bank in 1997, when it floated on the London Stock Exchange with the ticker symbol NRK. During the early 2000s the company borrowed substantially to fund mortgages, with the aim of ambitious growth, and also donated large amounts to charitable purposes and communities directly and through sponsorships. The global banking crisis beginning around 2007–2008 meant that it was unable to produce income as expected from its loans, and was at risk of being unable to repay the amounts it had borrowed. The news that the bank had approached the government for support with its liquidity led within 24 hours to a public lack of confidence and concerns that savings were at risk, and the bank failed following a bank run as people rushed to withdraw their savings. It was the first British bank in 150 years to fail due to a bank run.
ground_truth: 1797