Information: - Rugby union, or simply rugby, is a contact team sport which originated in England in the first half of the 19th century. One of the two codes of rugby football, it is based on running with the ball in hand. In its most common form, a game is between two teams of 15 players using an oval-shaped ball on a rectangular field with H-shaped goalposts on each try line. - The Middlesex Sevens is a Rugby Sevens tournament held annually at Twickenham stadium in London, England. It was first held in 1926, and started by Dr J.A. Russell-Cargill, a London-based Scot. The event was held at the end of the rugby union season in May every year for 75 years and moved to August in 2001 due to lack of available stadium dates and players in May. The Middlesex Sevens tournament was last played in 2011, as the new Premiership Rugby 7s Series caused many of the top clubs that previously took part to pull out. - The River Thames is a river that flows through southern England. At , it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn. It also flows through Oxford (where it is called Isis), Reading, Henley-on-Thames and Windsor. The lower reaches of the river are called the Tideway, derived from its long tidal reach up to Teddington Lock. It rises at Thames Head in Gloucestershire, and flows into the North Sea via the Thames Estuary. The Thames drains the whole of Greater London. - St Mary's University, Twickenham, is a research university located in Strawberry Hill, Twickenham, in South West London. Founded in 1850, it is generally acknowledged to be the oldest Catholic university in the United Kingdom. Formerly called "St Marys University College", it was granted full university title by the Privy Council on 23 January 2014. - Twickenham is a leafy suburban area of south west London, on the River Thames in the London Borough of Richmond upon Thames southwest of the centre of London. It has a large town centre and is famous as being the home of rugby union, with hundreds of thousands of spectators visiting Twickenham Stadium, the world's largest rugby stadium, each year. The historic riverside area is famous for its network of 18th-century buildings and pleasure grounds, many of which survive intact. This area has three grand period mansions with public access: York House, Marble Hill and Strawberry Hill House. Another has been lost, that belonging to 18th-century aphoristic poet Alexander Pope. Among these is the Neo-Gothic prototype home of Horace Walpole which has given its name to a whole district, Strawberry Hill, and is linked with the oldest Roman Catholic university in the country, St Mary's University, Twickenham. - Middlesex (abbreviation: Middx) was a county in southeast England that is now mostly part of Greater London, with small sections in neighbouring counties. It was established in the Anglo-Saxon system from the territory of the Middle Saxons, and existed as an official unit until 1965. The historic county included land stretching north of the River Thames from east to west of the City of London with the rivers Colne and Lea and a ridge of hills as the other boundaries. The largely low-lying county, dominated by clay in its north and alluvium on gravel in its south, was the second smallest by area in 1831. - A team sport includes any sport which involves two or more players working together towards a shared objective. A team sport is an activity in which individuals are organized into opposing teams which compete to win. Examples are basketball, volleyball, water polo, handball, lacrosse, cricket, baseball, and the various forms of football and hockey. - Twickenham Stadium ( / twknm / ; usually known as Twickenham or Twickers ) is a stadium in Twickenham , south west London , England . It is primarily a venue for rugby union and hosts England 's home test matches , the Middlesex Sevens , the Aviva Premiership final , the LV Cup and Heineken Cup matches . It has also hosted concerts by Rihanna , Iron Maiden , Bryan Adams , Bon Jovi , Genesis , U2 , The Rolling Stones , The Police , Eagles , R.E.M. and Lady Gaga , rugby league 's Challenge Cup final and conventions of Jehovah 's Witnesses , and will host American football as part of the NFL International Series from 2016 . It is the second largest stadium in the UK , after Wembley Stadium , and the fourth largest in Europe . - Twickenham Stadium (usually known as Twickenham or Twickers) is a rugby union stadium in Twickenham, south west London, England. Owned by the governing body of rugby union in England, the Rugby Football Union (the RFU), the stadium hosts home test matches for the England national rugby union team. Other rugby union games played at the stadium include the Middlesex Sevens, the Aviva Premiership final, the LV Cup, the Varsity Match between the universities of Oxford and Cambridge, and European Rugby Champions Cup matches. The RFU headquarters are based in the stadium. - London is the capital and most populous city of England and the United Kingdom, as well as the most populous city proper in the European Union. Standing on the River Thames in the south east of the island of Great Britain, London has been a major settlement for two millennia. It was founded by the Romans, who named it "Londinium". London's ancient core, the City of London, largely retains its medieval boundaries. Since at least the 19th century, "London" has also referred to the metropolis around this core, historically split between Middlesex, Essex, Surrey, Kent, and Hertfordshire, which today largely makes up Greater London, governed by the Mayor of London and the London Assembly. - England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west. The Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain (which lies in the North Atlantic) in its centre and south; and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight. Given the information above, choose from the list below the object entity that exhibits the relation 'operator' with the subject 'twickenham stadium'. Choices: - rugby football union - southern - sport - united kingdom
rugby football union