Question: Who was served seven months in prison after Sir Oliver Popplewell found him guilty of perjury?

Context paragraphs:
Hardin Bigelow: Hardin Bigelow (1809 in Michigan Territory – November 27, 1850 in San Francisco, California) was the first elected mayor of the city of Sacramento, California, which was known then as "Sacramento City."  Bigelow's efforts to construct Sacramento's first levees won him enough support to become mayor in Sacramento's first mayoral elections in February 1850.  Bigelow served seven months, from April to November, before succumbing to cholera; while he was mayor, Sacramento averted disaster in a potentially devastating flood, but fell victim to a series of April fires, a riot, and a cholera epidemic.

Laatste Zeven Maanden van Anne Frank: Laatste Zeven Maanden van Anne Frank (English title: "The Last Seven Months of Anne Frank") is a 1988 Dutch television documentary directed by Willy Lindwer about the last seven months in the life of diarist Anne Frank.  Seven different women, who were fellow prisoners of Anne Frank in the Westerbork transit camp, and the Auschwitz and Bergen-Belsen concentration camps, gave interviews about Anne's last months in this documentary.  Among them are Hanneli Goslar, Anne's childhood friend and fellow prisoner in Bergen-Belsen, and Janny Brandes-Brilleslijper, Anne's fellow prisoner in all three camps.  Both women, who were cell mates with Anne and Anne's sister Margot, are believed to be among the last known people to have seen Anne alive.

Jonathan Aitken: Jonathan William Patrick Aitken (born 30 August 1942) is a former Conservative Member of Parliament in the United Kingdom (1974–97), and a former Cabinet minister.  He was convicted of perjury in 1999 and received an 18-month prison sentence, of which he served seven months.  He is currently president of Christian Solidarity Worldwide.  Aitken was also a member of the Privy Council of the United Kingdom.

Sir Oliver Mowat Collegiate Institute: Sir Oliver Mowat Collegiate Institute (Sir Oliver Mowat CI, SOMCI, or Mowat) is a public high school located in Toronto, located in south east Scarborough governed by the Scarborough Board of Education until 1998 when it became the part of the newly formed Toronto District School Board.  Its motto is "De Monte Alto" ("From a mount high").

Wentworth family: The members of the Wentworth family of both the U.S.A and Australia, as listed below, are descended from Thomas Wentworth and Jane, the daughter of Sir Oliver Mirfield.  Sir Oliver died about 1522.  The American Wentworths are descended from Thomas' son Oliver.  The Australian Wentworths are descended from another son Roger.  The Wentworth family, along with the Arden family, the Berkeley family and the Swinton family, is descended in the male line from pre-Norman Conquest Anglo-Saxon roots.

Earl W. Vaughn: Earl Wray Vaughn (June 17, 1928 – April 1, 1986) was an American lawyer, politician and jurist.  He served for five terms in the North Carolina House of Representatives, the last as Speaker.  He then served for almost sixteen years as a Judge, and later Chief Judge, of the North Carolina Court of Appeals.  He was appointed to the North Carolina Supreme Court in 1985, but only served seven months before having to retire due to a sudden diagnosis of terminal lung and brain cancer.

Miles Conway Moore: Miles Conway Moore (April 17, 1845 – December 18, 1919) was the 14th and last Territorial Governor of Washington Territory.  He served seven months in office as governor, his two-year term ending prematurely when Washington attained statehood in November 1889.

The Sea Hawk: The Sea Hawk is a novel by Rafael Sabatini, originally published in 1915.  The story is set over the years 1588–1593 and concerns a retired Cornish seafaring gentleman, Sir Oliver Tressilian, who is villainously betrayed by a jealous half-brother.  After being forced to serve as a slave on a galley, Sir Oliver is liberated by Barbary pirates.  He joins the pirates, gaining the name "Sakr-el-Bahr" (the hawk of the sea), and swears vengeance against his brother.

Oliver Popplewell: Sir Oliver Bury Popplewell (b.August 15, 1927, Northwood, Middlesex), is a former British judge and cricket player.  He chaired the inquiry into the Bradford City stadium fire, presided over the libel case brought by Jonathan Aitken MP against "The Guardian" newspaper which eventually led to Aitken's imprisonment for perjury, and was widely reported for asking "What is Linford's lunchbox?"  during a case over which he was presiding, brought by Linford Christie.  He played first-class cricket for Cambridge University and was president of the Marylebone Cricket Club from 1994-96.  He wrote a book about his legal career.

Maryam Shafipour: Maryam Shafipour is an Iranian student activist.  Following seven months of pre-trial detention in Evin Prison, including more than two months in solitary confinement, Shafipour was sentenced in March 2014 to seven years in prison for her political activities.  Human rights organization have called for her release and condemned her conviction and prison sentence.  She was released in July 2015.

Supporting paragraphs: Oliver Popplewell Jonathan Aitken
Answer: Jonathan Aitken