Question: how is Tristram of Lyonesse and William Morris related?

Context articles: William Morris
John Fogelman
Tony Pinkney
William Morris Endeavor
Morris Motors
William Morris Gallery
Tristram of Lyonesse
William Chapman White
Tristram and Isoude stained glass panels
Tristram the Younger

William Morris (24 March 1834 – 3 October 1896) was an English textile designer, poet, novelist, translator, and socialist activist.
 Associated with the British Arts and Crafts Movement, he was a major contributor to the revival of traditional British textile arts and methods of production.
 His literary contributions helped to establish the modern fantasy genre, while he played a significant role in propagating the early socialist movement in Britain.
John Michael Fogelman (born c. 1965) is an American entrepreneur.
 He is the CEO of FactoryMade Ventures, an entertainment and media incubator.
 Formerly Executive Vice President and Head of the Motion Picture Department and the Intellectual Property Group at the William Morris Agency (WMA), Fogelman was a principal architect of the merger between William Morris and Endeavor Talent Agency, and served as a founding board member and an agent after the companies merged in 2009.
 He left William Morris Endeavor in 2011 to found FactoryMade.
Tony Pinkney (born 1956) is Senior Lecturer in the Department of English, Lancaster University, England.
 He played an active role in Oxford English Limited (OEL), a leftwing group pressing for progressive reforms in the Oxford University English Faculty between 1982 and 1992, and edited its journal, .
 Fred Inglis has asserted in his biography of Raymond Williams that ‘Tony Pinkney was the moving spirit of OEL’.
 Pinkney’s work on Raymond Williams challenged the notion of Williams as a doggedly realist writer and argued instead for his openness to certain currents in modernism and postmodernism.
 Pinkney’s most recent work has focused on William Morris and utopianism and he now runs a well-known blog on this topic, 'William Morris Unbound'.
 In August 2011 he launched the Kelmsgarth Press  with Makiko Minow, and he is now working on "News from Nowhere Two", a sequel to Morris's utopia.
William Morris Endeavor Entertainment, LLC, also known as William Morris Endeavor, WME or WME-IMG, is an American talent agency with offices in Beverly Hills, California, United States.
 The company was founded in April 2009, after the merger of the William Morris Agency and the Endeavor Agency.
 WME represents artists across all media platforms, specifically movies, television, music, theatre, digital and publishing.
 It also represents the NFL and NHL.
 WME also owns the Ultimate Fighting Championship and Miss Universe.
 The company is run by Co-CEOs Ari Emanuel and Patrick Whitesell.
Morris Motors Limited was a British privately owned motor vehicle manufacturing company formed in 1919 to take over the assets of William Morris's WRM Motors Limited and continue production of the same vehicles.
 By 1926 its production represented 42 per cent of British car manufacture a remarkable expansion rate attributed to William Morris's practice of buying in major as well as minor components and assembling them in his own factory.
 Self-financing through his enormous profits Morris did borrow some money from the public in 1926 and later shared some of Morris Motors' ownership with the public in 1936 when the new capital was used by Morris Motors to buy many of his other privately held businesses.
The William Morris Gallery, opened by Prime Minister Clement Attlee in 1950, is the only public museum devoted to English Arts and Crafts designer and early socialist William Morris.
 The gallery is located at Walthamstow in Morris's family home from 1848 to 1856, the former Water House, a substantial Grade II* listed Georgian dwelling of about 1750 which is set in its own extensive grounds (now Lloyd Park).
 The gallery underwent major redevelopment and reopened in August 2012; in 2013 it won the national prize for Museum of the Year.
Tristram of Lyonesse is a long epic poem written by the British poet Algernon Charles Swinburne, that recounts in grand fashion the famous medieval story of the ill-fated lovers Tristan and Isolde (Tristram and Iseult in Swinburne's version).
 It was first published in 1882 by Chatto and Windus, in a volume entitled "Tristram of Lyonesse and Other Poems".
 Swinburne himself considered "Tristram of Lyonesse" to be the crowning achievement of his poetic career (quoted by Harrison, p. 96).
 William Morris (referring to this poem) commented that Swinburne's work 'always seemed to me to be founded on literature, not on nature'.
William Chapman White (February 20, 1903 – November 28, 1955) was a foreign correspondent in the 1930s who became a columnist for the "New York Times" and the New York Herald Tribune.
 He is known especially for his 1954 book, "Adirondack Country".
 His connection with the Adirondacks was through his marriage to Ruth Morris, daughter of the theatrical agent, William Morris, founder of the William Morris Agency who owned a "cure camp" on Lake Colby in Saranac Lake, New York.
 The Adirondack Research Room of the Saranac Lake Free Library is named for him.
The Tristram and Isoude stained glass panels are a series of 13 small stained-glass windows made in 1862 by Morris, Marshall, Faulker & Co. for Harden Grange, the house of textile merchant Walter Dunlop, near Bingley in Yorkshire, England.
 Depicting the legend of Tristan and Iseult, they were designed by six of the leading Pre-Raphaelite artists of the day, to an overall design by William Morris.
 Since 1917 the panels have been held by Bradford Art Gallery.
Tristram the Younger, son of Tristram was the fourth and last king of Lyonesse according to the very late Italian romance "I Due Tristani".
 He was drowned when Lyonesse sank beneath the waves, shortly after the Battle of Camlann in 537.
 Following the battle, King Arthur's men fled west across Lyonesse, pursued by Mordred and his men.
 Arthur's men survived by reaching what are now the Isles of Scilly, but Mordred's men perished in the inundation.