Question: Sir (Ernest) Llewellyn Woodward (1890–1971) was a British historian, and was educated at which British independent private day school for boys, originally located in the City of London, and since 1933 it has been located on 285 acre of grounds at Sandy Lodge in the Three Rivers district of Hertfordshire?

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Three Rivers District Council: Three Rivers District Council is the local authority for the Three Rivers non-metropolitan district of England, the United Kingdom.  Three Rivers is located in the south-west of Hertfordshire, in the East of England region.  The Council itself is based in Rickmansworth, the largest settlement in the district, but also comprises Abbots Langley, Chorleywood, Croxley Green, Maple Cross, Mill End, Sarratt and South Oxhey.

Llewellyn Woodward: Sir (Ernest) Llewellyn Woodward (1890–1971) was a British historian.  He was educated at Merchant Taylors' School and Corpus Christi College, Oxford and after the First World War became a Lecturer in Modern History and fellow of All Souls College from 1919–1944 and a Fellow at New College from 1922–1939.  Later he was Montague Burton Professor of International Relations (1944–1947) and then Professor of Modern History at Oxford.  He later taught at Princeton University in the United States (1951–1962).  His scope was impressively wide, his first publication being on the late Roman Empire whilst on sick leave from service in the First World War but his most famous works being on the First World War.  He wrote "The Age of Reform" in the Oxford History of England.

Hamden Hall Country Day School: Hamden Hall Country Day School is a coeducational private day school in Hamden, Connecticut, educating students in preschool through grade 12.  Hamden Hall was founded in 1912 as a country day school for boys by Dr. John P. Cushing, its first headmaster.  It was the nation’s fourth country day school.  The school has been coeducational since 1927 and expanded to include classes through grade 12 in 1934.  Now split into three separate divisions, Hamden Hall enrolls the majority of its nearly 600 students in the upper and middle schools (Grades 7–12) and the remainder in the lower school (preschool through grade 6).

La Martiniere Calcutta: "La Martinière" Calcutta (informally known as LMC) is an independent private day school located in Kolkata (Calcutta), West Bengal.  It comprises two single-sex boys and girls school.  It was established in 1836 in accordance with the will of the French soldier of fortune and philanthropist, Major General Claude Martin.  They are both Christian schools, controlled by the Protestant Church of North India and independent from the Government, with English as the primary language of instruction.

South Oxhey: South Oxhey is a suburb of Watford in the Watford Rural parish of the Three Rivers district of Hertfordshire, England.  It is located in the south western corner of Hertfordshire and close to the boundary with Greater London.  At the 2011 Census South Oxhey's population was included in the Northwick Ward of Three Rivers Council.

Saint John XXIII High School: Saint John XXIII College Preparatory, formerly Pope John XXIII High School, is a Catholic independent, non-profit, coeducational, private day school in unincorporated Harris County, Texas, United States, near Katy.  The school serves grades 9-12.  The academic year consists of two semesters extending from approximately August to December and January to May.  Student leadership development through the Works of Ministries program is a distinct characteristic of the school, and leadership principles are integrated into every course at Saint John XXIII.  'SJ' is accredited by/a member of the Roman Catholic Archdiocese of Galveston-Houston (RCAGH), led by Archbishop Daniel DiNardo.  SJ is also the newest private day school in the Katy area for over fifty years, effective 2004.  It is located at 1800 West Grand Parkway North.

Mill End, Rickmansworth: Mill End is a semi-rural village in Hertfordshire, England, which has in recent times become a contiguous part of Rickmansworth.  Most of it is unparished (i.e. it does not have a civil parish council); part comes under Chorleywood Parish Council.  By the time 0f the 2011 Census a new civil parish had been formed called Maple Cross and Mill End.  All of Mill End forms part of Three Rivers District and so is administered by Three Rivers District Council and Hertfordshire County Council.

Three Rivers District (VHSL): The A Three Rivers District is a high school conference of the Virginia High School League which draws most of its members from the New River Valley.  The lone exception is Glenvar High School, which is located in western Roanoke County.  The district is named for the New River, Roanoke River, and Little River.  The schools in the Three Rivers District compete in A Region C with the schools of the A Hogoheegee District, the A Mountain Empire District and the A Pioneer District.

Merchant Taylors' School, Northwood: Merchant Taylors' School (MTS) is a British independent private day school for boys, originally located in the City of London.  Since 1933 it has been located on 285 acre of grounds at Sandy Lodge in the Three Rivers district of Hertfordshire.

St. Xavier's Collegiate School: St. Xavier's Collegiate School (informally SXCS) is an independent private day school for boys located in Kolkata, West Bengal, India.  It was founded in 1860 by the Jesuits, and it is named after Francis Xavier, a 16th century Jesuit missionary to India.  The school completed its sesquicentennial year in 2010.

Supporting paragraphs: Llewellyn Woodward Merchant Taylors' School, Northwood
Answer: Merchant Taylors' School (MTS)