Question: Rye House, Hertfordshire gave its name to the plan to assassinate which royal in 1683?

Context paragraphs:
2010 Team Speedway Junior World Championship: The 2010 Team Speedway Junior World Championship will be the 6th FIM Team Under-21 World Championship season.  The Final took place on September 5, 2010 at Rye House Stadium in Rye House, Great Britain.  It was the first Final in Great Britain.  The Championship was won by Denmark, who beat Sweden, the defending champion Poland and host team Great Britain.  It was first time-ever, when this championship was won by not-Polish riders.

Rye House railway station: Rye House railway station is in the Rye House area of Hoddesdon in Hertfordshire, England.  It is on the Hertford East branch of the West Anglia Main Line, and train services are provided by Abellio Greater Anglia.

Rye House Kart Circuit: Rye House Kart Circuit is a kart circuit, in Hoddesdon, Hertfordshire, England, and is adjacent to the Rye House Stadium.

Rye House Stadium: Rye House Stadium is a former greyhound racing and current speedway venue in Rye House near Hoddesdon, Hertfordshire.  It is situated adjacent to the River Lea Navigation.

John Ayloffe: John Ayloffe (c.1645 – 30 October 1685) was an English lawyer, satirist and Whig conspirator, responsible for several pieces of violently anti-Stuart propaganda of the 1670s.  In 1683, he was involved in the Rye House Plot to assassinate Charles II and his brother.

Rye House Plot: The Rye House Plot of 1683 was a plan to assassinate King Charles II of England and his brother (and heir to the throne) James, Duke of York.  Historians vary in their assessment of the degree to which details of the conspiracy were finalised.  Whatever the state of the assassination plot, plans to mount a rebellion against the Stuart monarchy were being entertained by some opposition leaders in England, and the government cracked down hard on those in a series of state trials, accompanied with repressive measures and widespread searches for arms.  The Plot presaged, and may have hastened, the rebellions of 1685, the Monmouth Rebellion and Argyll's Rising.

Richard Rumbold: Richard Rumbold (1622–1685) was a Cromwellian soldier who took part in the failed 1683 Rye House Plot to assassinate King Charles II of England and his brother James.  When the plot was discovered, Rumbold fled the country.  In 1685, after Charles II had died and James had become king, Rumbold participated in a plan to drive James from the throne.  The plan failed and Rumbold was executed.

Rye House power station: Rye House Power Station is a 715 MW combined cycle gas turbine (CCGT) power station close to Rye House railway station in Hoddesdon, Hertfordshire.

Rye Meads: Rye Meads is a 58.5 hectare biological Site of Special Scientific Interest (SSSI) in Rye House, Hertfordshire.  It is also part of the Lea Valley RAMSAR site (a group of internationally important wetland sites) and a Special Protection Area.  The SSSI is divided into three areas.  North of Rye Road is the Rye Meads nature reserve, which is open to the public.  The western half of this nature reserve, next to the River Lea in the Lee Valley Regional Park, is managed by the Royal Society for the Protection of Birds (RSPB).  The eastern half is managed by the Hertfordshire and Middlesex Wildlife Trust (HMWT).  The SSSI also includes a meadow and lagoons owned by Thames Water south of Rye Road which is not open to the public.

Rye House, Hertfordshire: Rye House near Hoddesdon in Hertfordshire is a former fortified manor house, located in what is now the Lee Valley Regional Park.  The gatehouse is the only surviving part of the structure and is a Grade I listed building.  The house gave its name to the Rye House Plot, an assassination attempt of 1683 that was a violent consequence of the Exclusion Crisis in British politics at the end of the 1670s.

Supporting paragraphs: Rye House, Hertfordshire Rye House Plot
Answer: King Charles II