Question: What was the place of death of George IV, former ruler of the country where the company that owns Virgin Holidays Cruises is based?

full_context: Document 1: Very (online retailer): Very (also known as Very.co.uk) is a British online retailer with headquarters in Speke, Liverpool. The brand was launched in the UK in July 2009 as part of Shop Direct. Very had formerly been known as Littlewoods Direct.
Document 2: Southampton: The importance of Southampton to the cruise industry was indicated by P&O Cruises's 175th anniversary celebrations, which included all seven of the company's liners visiting Southampton in a single day. Adonia, Arcadia, Aurora, Azura, Oceana, Oriana and Ventura all left the city in a procession on 3 July 2012.
Document 3: The Horses of Helios: The Horses of Helios, also known as The Four Bronze Horses of Helios, is a bronze sculpture of four horses by Rudy Weller. It is one half of a commission installed in 1992 when the adjacent Criterion Theatre was refurbished. The other half, the "Daughters of Helios" or "Three Graces", is a sculpture of three women leaping off the building six stories above.
Document 4: The Copper Horse: The northern end of the Long Walk is at the George IV Gateway at Windsor Castle. The Copper Horse is a statue of George III on horseback, and is said to represent George as an emperor in the Roman tradition riding without stirrups, along the lines of the Equestrian Statue of Marcus Aurelius. A comparison has also been made to the equestrian statue of Peter the Great in Saint Petersburg.
Document 5: Virgin Holidays Cruises: Virgin Holidays Cruises is a company owned by Virgin Group and is part of Virgin Holidays, headquartered in Crawley. The company specialises in package deals with cruises provided by other cruise lines.
Document 6: MSC Cruises: MSC Cruises is a global cruise line that was founded in Italy, is registered in Switzerland, and has its headquarters in Geneva. MSC Cruises is the world's largest privately owned cruise company, employing 16,300 people worldwide and having offices in 45 countries as of July 2014. MSC Cruises (Italian: MSC Crociere S. p.A.) is part of the Mediterranean Shipping Company S.A. (MSC), the world's second biggest container shipping operator.
Document 7: Equestrian Portrait of Charles I: The Equestrian Portrait of Charles I (also known as Charles I on Horseback) is an oil painting on canvas by Anthony van Dyck, showing Charles I on horseback. Charles I had become King of England, Scotland and Ireland in 1625 on the death of his father James I, and Van Dyck became Charles's Principal Painter in Ordinary in 1632.
Document 8: Virgin Games: Virgin Games is a company that provides online gambling services, predominantly in the United Kingdom, that licences the brand from Sir Richard Branson's Virgin Enterprises.
Document 9: Regisole: The Regisole ("Sun King") was a bronze classical or Late Antique equestrian monument, highly influential during the Italian Renaissance but destroyed in 1796. It was originally erected at Ravenna, in what is now Italy, but was moved to Pavia in the Middle Ages, where it stood on a column before the cathedral, as an emblem of communal pride and Pavia's deep connection with imperial Rome.
Document 10: Avalon Waterways: Avalon Waterways is a river cruise company owned by the Globus family of brands and offers cruises in Europe, China, Southeast Asia, the United States, South America and the Galápagos Islands. The company became a member of Cruise Lines International Association (CLIA) in August 2009.
Document 11: New Mexico Spaceport Authority: The state of New Mexico has privatized the operations of Spaceport America; the spaceport will be operated by Virgin Galactic, a component of the Virgin Group of global companies operated by Sir Richard Branson. While the Spaceport Authority will exercise public-sector oversight, Virgin Galactic will be the "anchor tenant" of the spaceport.
Document 12: Virgin Galactic: Virgin Galactic is a British spaceflight company within the Virgin Group. It is developing commercial spacecraft and aims to provide suborbital spaceflights to space tourists and suborbital launches for space science missions. Virgin Galactic plans to provide orbital human spaceflights as well. SpaceShipTwo, Virgin Galactic's suborbital spacecraft, is air launched from beneath a carrier airplane known as White Knight Two.
Document 13: Virgin Drinks: After thirteen years, the brand started to massively decline as rival Coca-Cola had made exclusive distribution deals in big stores and restaurants. This led to Virgin only being sold in select supermarkets and local stores. Virgin Group decided it could not compete with cola rivals. In 2007, Virgin Drinks sold over the rights of Virgin Cola to a company called Silver Spring Soft Drinks. Virgin Vodka was discontinued when Virgin Drinks failed to find a buyer. Virgin Drinks were made defunct in 2007.
Document 14: Equestrian statue of Theodore Roosevelt: Equestrian Statue of Theodore Roosevelt is a 1939 bronze sculpture by James Earle Fraser. It is located at the American Museum of Natural History, New York City. The equestrian statue depicts Theodore Roosevelt on horseback. Standing to either side of him are an American Indian and an African.
Document 15: Holland America Line: Holland America Line is a British / American - owned cruise line, a subsidiary of Carnival Corporation & plc. Originating in the Netherlands, the company is now based in Seattle, United States.
ground_truth: Windsor Castle
sub_queries: Virgin Holidays Cruises >> owned by Answer: Virgin Group
Virgin Group >> country Answer: United Kingdom
George IV of United Kingdom >> place of death Answer: Windsor Castle