Question: Daphne Slater attended what school founded by one of the Great Twelve Livery Company's of the City of London? 

Context articles: Daphne Slater
Worshipful Company of Arts Scholars
Worshipful Company of Goldsmiths
Honourable Company of Master Mariners
Adams' Grammar School
Masters of the Worshipful Company of Brewers
Worshipful Company of Mercers
Worshipful Company of Drapers
Guild of Mercers' Scholars
Haberdashers' Aske's School for Girls

Daphne Helen Slater (3 March 1928 – 4 October 2012) was an English actress noted for Shakespearian and period films.
 She was born in London and educated at Haberdashers' Aske's School for Girls, when it was in Acton, before attending the Royal Academy of Dramatic Art, where she won the academy's gold medal.
The Worshipful Company of Arts Scholars is the 110th livery company of the City of London.
 It was recognized as a company without Livery in 2010, and being constituted as a Livery Company on 11 February 2014 by the Court of Aldermen.
The Worshipful Company of Goldsmiths is one of the Great Twelve Livery Companies of the City of London.
The Honourable Company of Master Mariners is one of the Livery Companies of the City of London.
 The Company was formed in 1926; it was made a Livery Company by the City of London in 1932, making it the first new Livery Company to be formed since 1746.
 While the other Livery Companies are entitled to the style "Worshipful", the Master Mariners are styled "Honourable", King George V having granted them that honour in 1928.
Adams' Grammar School (often abbreviated as AGS) is a grammar school for boys, located in Newport, Shropshire, offering day and boarding education.
 It was founded in 1656 by William Adams, a wealthy member of the Worshipful Company of Haberdashers (one of the Great Twelve Livery Companies of the City of London).
The Worshipful Company of Brewers is a livery company of the City of London, ranked 14th in the companies's order of precedence.
 Its origins can be traced back with certainty to 1292, although it probably existed in some form up to a century earlier as the Guild of Our Lady and St Thomas Becket.
 Its successor, the Mistery of Free Brewers, were granted the right by the Mayor and Aldermen of London to appoint Masters and Wardens in 1406.
 Henry VI granted the first of a series of Royal Charters to the company in 1437–38.
 Until the last century, the company admitted non-brewers so that they could be represented by a livery company.
 From the mid-16th century, masters were elected annually; all of those whose names are known are listed below.
The Worshipful Company of Mercers is the premier Livery Company of the City of London and ranks first in the order of precedence of the Companies.
 It is the first of the Great Twelve City Livery Companies.
 Although of even older origin, the Company was incorporated under a Royal Charter in 1394, the Company's earliest extant Charter.
 The Company's aim was to act as a trade association for general merchants, and especially for exporters of wool and importers of velvet, silk and other luxurious fabrics (mercers).
 By the 16th century many members of the Company had lost any connection with the original trade.
 Today, the Company exists primarily as a charitable institution, supporting a variety of causes.
 The Company's motto is "Honor Deo", Latin for "Honour to God".
The Worshipful Company of Drapers is one of the 110 livery companies of the City of London.
 It has the formal name The Master and Wardens and Brethren and Sisters of the Guild or Fraternity of the Blessed Mary the Virgin of the Mystery of Drapers of the City of London.
 More usually known simply as the Drapers' Company, it is one of the historic Great Twelve Livery Companies and was founded during the Middle Ages.
The Guild of Mercers' Scholars, established circa 1947 as Civic Guild of Old Mercers by ex-pupils of Mercers' School, has the stated aim of encouraging former pupils of the Mercers' School to become Freemen of the City of London, and Liverymen: and to select, if possible, a Livery Company appropriate to their own trade or profession.
 The Guild is run along the same lines as a Livery Company.
Haberdashers' Aske's School for Girls is an independent day school in Elstree, Hertfordshire.
 It is often referred to as "Habs" (or "Habs Girls" to distinguish it from the neighbouring Haberdashers' Aske's Boys' School).
 The school was founded in 1875 by the Worshipful Company of Haberdashers, one of the Great Twelve Livery Companies of the City of London.