Question: When did the leader of the Wilton Circle die?

Context paragraphs:
Os Trapalhões: Os Trapalhões (] ) was a Brazilian comedy group and also a television series created by Wilton Franco.  Its members were Dedé Santana, Zacarias, Mussum and their leader Didi Mocó, that was played by Renato Aragão.  The name "Os Trapalhões" (which can be translated as "The Bumbling Ones") is derived from the Portuguese verb "atrapalhar", which means the opposite of "helping", "to do something the wrong way" or "to Those that confuse".  The name is translated "Tramps" in English DVD subtitles.  It was originally aired by Rede Globo from 1977 to 1993.

Michelle Erickson: Michelle Erickson (born 1960) is an American ceramic artist who works with contemporary and reproduction pottery.  She received her BFA from the College of William and Mary in 1982 and recently finished two residencies; one at the Visual Arts Center in Richmond, VA, and the other at Starworks in Star and Seagrove, NC.  Michelle currently has a solo exhibition project titled "You &I Are …Earth" located at Wilton House Museum in Richmond, VA.  Additionally, she is affiliated with the National Council on Education for the Ceramics Arts, American Craft Council, and American Ceramics Circle.

Mary Sidney: Mary Herbert, Countess of Pembroke (née Sidney; 27 October 1561 – 25 September 1621) was one of the first English women to achieve a major reputation for her poetry and literary patronage.  By the age of 39, she was listed with her brother Philip Sidney, Edmund Spenser, and William Shakespeare, as one of the notable authors of her time in the verse miscellany by John Bodenham, "Belvedere".  The influence of her "Antonius" is widely recognized: it stimulated a revived interest in the soliloquy based on classical models, and was a likely source (among others) for both the 1594 closet drama "Cleopatra" by Samuel Daniel and Shakespeare’s "Antony and Cleopatra" (1607).  Sidney was also known for her translation of Petrarch's "Triumph of Death", but it is her lyric translation of the Psalms that has secured her poetic reputation.

Daychovo horo: Daichovo horo (Bulgarian: Дайчово хopo ) is a Bulgarian folk dance done to a 9 beat meter.  It is unique in two ways: it is a circle dance (most Bulgarian dances are either line or couple dances), and yet it has a leader (most circle dances have no leader).

Vaughn Monroe: Vaughn Wilton Monroe (October 7, 1911 – May 21, 1973) was an American baritone singer, trumpeter, big band leader, actor, and businessman, most popular in the 1940s and 1950s.  He has two stars on the Hollywood Walk of Fame; for recording and radio.

Jiro Yoshihara: Jiro Yoshihara (吉原 治良 , Yoshihara Jirō , January 1, 1905 – February 19, 1972) was a Japanese painter.  In 1954, along with Shōzō Shimamoto, he co-founded the avant-garde Gutai group in Osaka.  He was a businessman and scion of a family that owned a cooking-oil company, along with a group of young, Hanshin-region artists.  Yoshihara had taught Western-style painting before becoming Gutai’s leader.  Yoshihara wrote the "Gutai Manifesto" in 1956 and was the leader of the so named group of internationally acclaimed avant-garde artists representative of Japan's post-war art world.  He worked in surrealist and abstract expressionist painting styles before turning, in his final years, to the repeated depiction of circles reminiscent of "satori," the enlightenment of Zen.  This white circle was made by leaving the canvas unpainted while painting the background black.  When asked about his circles, Yoshihara said that he could not manage to paint even one circle with satisfaction, an indication of the depths of his pursuit of this form.  Indeed, no two of his circles are shaped exactly alike.  He was the leader of the Gutai Group until his death in 1972.

Double linking: Double linking is an organizing principle developed by Gerard Endenburg, a Dutch engineer, as part of the so-called sociocratic circular method.  It operates as an extension of Rensis Likert's (single) linking pin.  In the sociocratic approach, decision-making is structured in circles.  Each circle is connected to the next higher circle by way of the functional leader (appointed in the next higher circle) and a representative chosen in the circle.  Both the functional leader and the representative participate in policy decisions taken in the lower as well as higher circle.

Wilton Circle: The Wilton Circle were an influential group of 16th-century English poets, led by Mary Sidney.  They were based at Wilton House, Wiltshire, which was run by the half-brother of Walter Raleigh.  Sidney turned Wilton into a "paradise for poets", and the circle included Edmund Spenser, Michael Drayton, Sir John Davies and Samuel Daniel.

Eugene Wilton Frémaux: Eugene Wilton Frémaux (August 24, 1887 – March 14, 1969.  was an Alexandria, Louisiana businessman and civic leader who in 1937 became the sole owner of Brown Hide Company.  The company did an extensive business in green and salt hides which were shipped to tanners in various parts of the country.  In 1942 he joined Alexandria Steam Laundry Company as its Secretary-Treasurer.

Lockgreen: Lockgreen is an upper-class gated community located in Richmond, Virginia's West End.  The neighborhood lies within Wilton and is served by Lockgreen Circle.  Lockgreen was built as an extension to Windsor Farms's Old Locke subdivision.  The zip code for the subdivision is 23226.

Supporting paragraphs: Wilton Circle Mary Sidney
Answer: 25 September 1621